ColorPicker custom Theme

[Mikhailo Shuturma]

Hello. I was created custom theme for RadColorPicker, but when I apply this custom theme i receive exception (see attached picture)
Note I use latest version (Q1 2010) of WPF controls
Here my code

<ResourceDictionary
        xmlns:customTheme="clr-namespace:BlackTheme_WPF"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:primitives="clr-namespace:Telerik.Windows.Controls.Primitives;assembly=Telerik.Windows.Controls"
        xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input"
        xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls"
        xmlns:animation="clr-namespace:Telerik.Windows.Controls.Animation;assembly=Telerik.Windows.Controls"
        xmlns:telerikChromes="clr-namespace:Telerik.Windows.Controls.Chromes;assembly=Telerik.Windows.Controls">
<customTheme:BlackTheme x:Key="Theme" />
    <LinearGradientBrush x:Key="ControlOuterBorder_Pressed" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FF282828"/>
        <GradientStop Color="#FF5F5F5F" Offset="1"/>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="ControlBackground_Pressed" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FFFFDCAB" Offset="0"/>
        <GradientStop Color="#FFFFD18F" Offset="0.5"/>
        <GradientStop Color="#FFFE9227" Offset="0.5"/>
        <GradientStop Color="#FFFFBA74" Offset="0"/>
    </LinearGradientBrush>
    <LinearGradientBrush x:Key="ControlInnerBorder_Pressed" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FFB69A78"/>
        <GradientStop Color="#FFFFE17A" Offset="0.126"/>
    </LinearGradientBrush>
    <SolidColorBrush x:Key="ControlElement_Normal" Color="#FF000000" />


    <SolidColorBrush x:Key="ColorPicker_TitleBackground" Color="#FFDEDEDE" />
    <SolidColorBrush x:Key="ColorPicker_TitleBorder" Color="#FF848484" />
    <SolidColorBrush x:Key="ColorPicker_Background" Color="#FFFFFFFF" />
    <SolidColorBrush x:Key="ColorPicker_OuterBorder" Color="#FF848484" />
    <SolidColorBrush x:Key="ColorPicker_InnerBorder" Color="#FFF5F5F5" />
    <SolidColorBrush x:Key="ColorPicker_Foreground" Color="#FF000000" />
    <LinearGradientBrush x:Key="ColorPicker_ButtonBackground_MouseOver" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FFFFFBA3" Offset="1" />
        <GradientStop Color="#FFFFFBDA" Offset="0" />
        <GradientStop Color="#FFFFD25A" Offset="0.43" />
        <GradientStop Color="#FFFEEBAE" Offset="0.42" />
    </LinearGradientBrush>
    <SolidColorBrush x:Key="ColorPicker_ButtonInnerBorder_MouseOver" Color="#FFFFFFFF" />
    <SolidColorBrush x:Key="ColorPicker_ButtonBorder_MouseOver" Color="#FFFFC92B" />
    <CornerRadius x:Key="ColorPicker_ButtonOuterBorder_LeftCornerRadius">1,0,0,1</CornerRadius>
    <CornerRadius x:Key="ColorPicker_ButtonOuterBorder_RightCornerRadius">0,1,1,0</CornerRadius>

    <SolidColorBrush x:Key="ColorPaletteViewItem_Border" Color="#FFC9C9CB" />
    <SolidColorBrush x:Key="ColorPaletteViewItem_OuterBorder_MouseOver" Color="#FFFFC92B" />
    <SolidColorBrush x:Key="ColorPaletteViewItem_InnerBorder_MouseOver" Color="#FFFFFFFF" />
    <SolidColorBrush x:Key="ColorPaletteViewItem_OuterBorder_Selected" Color="#FF5D5D5D" />
    <LinearGradientBrush x:Key="ColorPaletteViewItem_InnerBorder_Selected" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="#FFB69A78" />
        <GradientStop Color="#FFFFE17A" Offset="0.126" />
    </LinearGradientBrush>

    <CornerRadius x:Key="ColorPicker_HeaderButtonOuterBorder_CornerRadius">1</CornerRadius>
    <CornerRadius x:Key="ColorPicker_HeaderButtonInnerBorder_CornerRadius">0</CornerRadius>
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonBackground" Color="#FFDEDEDE" />
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonBorder" Color="#FF848484" />
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonOuterBorder_MouseOver" Color="#FFFFC92B" />
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonInnerBorder_MouseOver" Color="#FFFFFFFF" />
    <LinearGradientBrush x:Key="ColorPicker_HeaderButtonInnerBackground_MouseOver" EndPoint="0.5,1"
            StartPoint="0.5,0">
        <GradientStop Color="#FFFFFBA3" Offset="1" />
        <GradientStop Color="#FFFFFBDA" Offset="0" />
        <GradientStop Color="#FFFFD25A" Offset="0.43" />
        <GradientStop Color="#FFFEEBAE" Offset="0.42" />
    </LinearGradientBrush>
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonOuterColorStroke" Color="#FFFFC92B" />
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonColorFill" Color="#FF000000" />
    <SolidColorBrush x:Key="ColorPicker_HeaderButtonInnerColorStroke" Color="#FFBFBFBF" />

    <Style TargetType="telerikInput:RadColorPaletteViewItem" x:Key="DefaultStyle">
        <Setter Property="Color" Value="Black" />
    </Style>

    <Style TargetType="Button" x:Key="RadColorPicker_HeaderButtonStyle">
        <Setter Property="Foreground" Value="{StaticResource ColorPicker_Foreground}" />
        <Setter Property="FontWeight" Value="Normal" />
        <Setter Property="BorderBrush"
                Value="{StaticResource ColorPicker_HeaderButtonOuterColorStroke}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Grid>
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="Auto" MinWidth="25" />
                            <ColumnDefinition Width="*" />
                        </Grid.ColumnDefinitions>

                        <Border MinWidth="25" HorizontalAlignment="Left"
                                Background="{StaticResource ColorPicker_HeaderButtonBackground}"
                                BorderBrush="{StaticResource ColorPicker_HeaderButtonBorder}"
                                BorderThickness="0 0 1 0" />

                        <Border BorderThickness="1" Grid.ColumnSpan="2" Opacity="0"
                                CornerRadius="{StaticResource ColorPicker_HeaderButtonOuterBorder_CornerRadius}"
                                x:Name="border_mouseover"
                                BorderBrush="{StaticResource ColorPicker_HeaderButtonOuterBorder_MouseOver}">
                            <Border BorderThickness="1"
                                    CornerRadius="{StaticResource ColorPicker_HeaderButtonInnerBorder_CornerRadius}"
                                    BorderBrush="{StaticResource ColorPicker_HeaderButtonInnerBorder_MouseOver}"
                                    Background="{StaticResource ColorPicker_HeaderButtonInnerBackground_MouseOver}" />
                        </Border>

                        <Border Margin="2 2 3 2" BorderBrush="{TemplateBinding BorderBrush}"
                                BorderThickness="1" CornerRadius="2" x:Name="rectangleborder">
                            <Rectangle
                                    Stroke="{StaticResource ColorPicker_HeaderButtonInnerColorStroke}"
                                    Fill="{StaticResource ColorPicker_HeaderButtonColorFill}"
                                    MinWidth="14" MinHeight="14" VerticalAlignment="Center"
                                    Margin="1" />
                        </Border>

                        <ContentPresenter Grid.Column="1" x:Name="contentPresenter" Margin="7 0 0 0"
                                Content="{TemplateBinding Content}"
                                ContentTemplate="{TemplateBinding ContentTemplate}"
                                VerticalAlignment="Center" HorizontalAlignment="Left" />

                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Opacity" TargetName="border_mouseover" Value="1" />
                        </Trigger>
                        <Trigger Property="IsFocused" Value="True" />
                        <Trigger Property="IsPressed" Value="True">
                            <Setter Property="Opacity" TargetName="border_mouseover" Value="1" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style x:Key="ColorButtonDefaultStyle" TargetType="Button">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Grid Height="25" Width="23">
                        <telerikChromes:ButtonChrome x:Name="Chrome" RenderNormal="False"
                                telerik:StyleManager.Theme="{StaticResource Theme}"
                                RenderPressed="{TemplateBinding IsPressed}"
                                RenderHighlighted="{TemplateBinding IsMouseOver}"
                                CornerRadius="{StaticResource ColorPicker_ButtonOuterBorder_LeftCornerRadius}" />
                        <Grid Height="25" Width="23">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="0.664*" />
                                <RowDefinition Height="0.336*" />
                            </Grid.RowDefinitions>
                            <Path Fill="#FF364F87" Stretch="Fill" VerticalAlignment="Top"
                                    HorizontalAlignment="Center" RenderTransformOrigin="0.5,0.5"
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                                    Width="9.91" Margin="-2 3 0 0" Height="9.537">
                                <Path.RenderTransform>
                                    <ScaleTransform ScaleX="1" ScaleY="1" />
                                </Path.RenderTransform>
                            </Path>
                            <Rectangle Width="16" Margin="-2 0 0 0"
                                    Fill="{TemplateBinding Background}" Height="4.232" Grid.Row="1"
                                    VerticalAlignment="Top" />
                        </Grid>

                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True" />
                        <Trigger Property="IsFocused" Value="True" />
                        <Trigger Property="IsPressed" Value="True" />
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Background" Value="Black" />
    </Style>

    <Style x:Key="ToggleButtonIconStyle" TargetType="ToggleButton">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ToggleButton">
                    <Grid Height="25" Width="11">
                        <telerikChromes:ButtonChrome RenderNormal="False"
                                telerik:StyleManager.Theme="{StaticResource Theme}"
                                RenderPressed="{TemplateBinding IsPressed}"
                                RenderHighlighted="{TemplateBinding IsMouseOver}"
                                CornerRadius="{StaticResource ColorPicker_ButtonOuterBorder_RightCornerRadius}" />

                        <Border x:Name="BackgroundChecked" BorderThickness="1" Height="25"
                                Width="11" Visibility="Collapsed"
                                CornerRadius="{StaticResource ColorPicker_ButtonOuterBorder_RightCornerRadius}"
                                BorderBrush="{StaticResource ControlOuterBorder_Pressed}"
                                Background="{StaticResource ControlBackground_Pressed}">
                            <Border BorderThickness="1"
                                    BorderBrush="{StaticResource ControlInnerBorder_Pressed}" />
                        </Border>

                        <Path x:Name="Arrow" Fill="{StaticResource ControlElement_Normal}"
                                Stretch="Fill" Stroke="{x:Null}"
                                Data="M0,0 L5,0 5,1 4,1 4,2 3,2 3,3 2,3 2,2 1,2 1,1 0,1 0,0 z"
                                Width="5" Height="3" />

                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True" />
                        <Trigger Property="IsFocused" Value="True" />
                        <Trigger Property="IsPressed" Value="True" />
                        <Trigger Property="IsChecked" Value="True">
                            <Setter Property="Visibility" TargetName="BackgroundChecked"
                                    Value="Visible" />
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>


    <Style TargetType="telerikInput:RadColorPaletteViewItem" x:Key="{telerik:ThemeResourceKey ThemeType=customTheme:BlackTheme, ElementType=telerikInput:RadColorPaletteViewItem}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="telerikInput:RadColorPaletteViewItem">
                    <Grid x:Name="RootElement" Margin="0"
                        SnapsToDevicePixels="True">
                        <Rectangle x:Name="color" MinHeight="11" MinWidth="11" Stretch="Fill"
                                Margin="2 0" ToolTipService.ToolTip="{Binding }"
                                Fill="{TemplateBinding Content}" />
                        <Border MinHeight="13" MinWidth="13"
                                BorderBrush="{StaticResource ColorPaletteViewItem_Border}"
                                Margin="2 0" x:Name="borderContent" VerticalAlignment="Stretch"
                                BorderThickness="1">
                            <Border BorderThickness="1" x:Name="InnerborderContent" />
                        </Border>

                        <Border MinHeight="13" MinWidth="13"
                                BorderBrush="{StaticResource ColorPaletteViewItem_OuterBorder_MouseOver}"
                                Margin="2 0" x:Name="border" VerticalAlignment="Stretch"
                                BorderThickness="1" Visibility="Collapsed">
                            <Border BorderThickness="1" x:Name="Innerborder"
                                    BorderBrush="{StaticResource ColorPaletteViewItem_InnerBorder_MouseOver}" />
                        </Border>
                    </Grid>
                    <ControlTemplate.Triggers>

                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsSelected" Value="false" />
                                <Condition Property="IsMouseOver" Value="true" />
                            </MultiTrigger.Conditions>
                            <Setter Property="Visibility" TargetName="border" Value="Visible" />
                            <Setter Property="BorderBrush" TargetName="border"
                                    Value="{StaticResource ColorPaletteViewItem_OuterBorder_MouseOver}" />
                            <Setter Property="BorderBrush" TargetName="Innerborder"
                                    Value="{StaticResource ColorPaletteViewItem_InnerBorder_MouseOver}" />
                        </MultiTrigger>
                        <Trigger Property="IsSelected" Value="True">
                            <Trigger.EnterActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames
                                                Storyboard.TargetProperty="Visibility"
                                                Storyboard.TargetName="border">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Visible</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </BeginStoryboard>
                            </Trigger.EnterActions>
                            <Trigger.ExitActions>
                                <BeginStoryboard>
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames
                                                Storyboard.TargetProperty="Visibility"
                                                Storyboard.TargetName="border">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <Visibility>Collapsed</Visibility>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </BeginStoryboard>
                            </Trigger.ExitActions>

                            <Setter Property="BorderBrush" TargetName="border"
                                    Value="{StaticResource ColorPaletteViewItem_OuterBorder_Selected}" />
                            <Setter Property="BorderBrush" TargetName="Innerborder"
                                    Value="{StaticResource ColorPaletteViewItem_InnerBorder_Selected}" />
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="Visibility" TargetName="border">
                                <Setter.Value>
                                    <Visibility>Visible</Visibility>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="false">
                            <Setter Property="Visibility" TargetName="border">
                                <Setter.Value>
                                    <Visibility>Collapsed</Visibility>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Content" Value="Color" />
        <Setter Property="Color" Value="Green" />
    </Style>

    <Style TargetType="telerikInput:RadColorPaletteView"
        x:Key="{telerik:ThemeResourceKey ThemeType=customTheme:BlackTheme, ElementType=telerikInput:RadColorPaletteView}">
        <Setter Property="Background" Value="{StaticResource ColorPicker_Background}" />
        <Setter Property="BorderBrush" Value="{StaticResource ColorPicker_OuterBorder}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="ItemContainerStyle" Value="{StaticResource DefaultStyle}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="telerikInput:RadColorPaletteView">
                    <Border BorderBrush="{TemplateBinding BorderBrush}"
                            Background="{TemplateBinding Background}"
                            BorderThickness="{TemplateBinding BorderThickness}">
                        <ItemsPresenter x:Name="ItemsPresenter" Margin="0,2,0,2" />
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="ItemsPanel">
            <Setter.Value>
                <ItemsPanelTemplate>
                    <primitives:RadUniformGrid x:Name="uniformGrid" HorizontalAlignment="Stretch"
                            ChildrenFlow="Vertical" VerticalAlignment="Stretch" Columns="10">
                    </primitives:RadUniformGrid>
                </ItemsPanelTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Margin" Value="0" />
    </Style>

    <Style TargetType="telerikInput:RadColorSelector"
        x:Key="{telerik:ThemeResourceKey ThemeType=customTheme:BlackTheme, ElementType=telerikInput:RadColorSelector}">
        <Setter Property="Background" Value="{StaticResource ColorPicker_Background}" />
        <Setter Property="BorderBrush" Value="{StaticResource ColorPicker_OuterBorder}" />
        <Setter Property="BorderThickness" Value="1" />
        <Setter Property="Foreground" Value="{StaticResource ColorPicker_Foreground}" />
        <Setter Property="FontWeight" Value="Bold" />
        <Setter Property="FontStyle" Value="Normal" />
        <Setter Property="MainPaletteItemsStyle" Value="{StaticResource DefaultStyle}" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="telerikInput:RadColorSelector">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="2"
                            BorderThickness="{TemplateBinding BorderThickness}">
                        <Border BorderBrush="{StaticResource ColorPicker_InnerBorder}"
                                BorderThickness="1" CornerRadius="1">
                            <Grid x:Name="RootElement" Margin="0"
                                    Background="{TemplateBinding Background}">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto" />
                                    <RowDefinition Height="Auto" />
                                    <RowDefinition Height="Auto" />
                                    <RowDefinition Height="*" />
                                    <RowDefinition Height="Auto" />
                                    <RowDefinition Height="Auto" />
                                </Grid.RowDefinitions>
                                <Button Content="{TemplateBinding NoColorText}"
                                        x:Name="PaletteHeader" Grid.Row="0"
                                        Background="{TemplateBinding Background}"
                                        Style="{StaticResource RadColorPicker_HeaderButtonStyle}" />
                                <Border Margin="0 0 0 3" Grid.Row="1"
                                        Background="{StaticResource ColorPicker_TitleBackground}"
                                        BorderBrush="{StaticResource ColorPicker_TitleBorder}"
                                        BorderThickness="0 0 0 1">
                                    <TextBlock Margin="10,2,2,2" x:Name="mainPaletteHeader"
                                            FontStyle="{TemplateBinding FontStyle}"
                                            FontWeight="{TemplateBinding FontWeight}"
                                            Foreground="{TemplateBinding Foreground}"
                                            Text="{TemplateBinding MainPaletteHeaderText}" />
                                </Border>
                                <telerikInput:RadColorPaletteView
                                        Background="{TemplateBinding Background}" Grid.Row="2"
                                        Margin="0,0,0,-3" VerticalAlignment="Center"
                                        x:Name="HeaderPalette" BorderBrush="Transparent"
                                        BorderThickness="0">
                                    <telerikInput:RadColorPaletteView.ItemsPanel>
                                        <ItemsPanelTemplate>
                                            <primitives:RadUniformGrid Background="Transparent"
                                                    Columns="10">
                                            </primitives:RadUniformGrid>
                                        </ItemsPanelTemplate>
                                    </telerikInput:RadColorPaletteView.ItemsPanel>
                                </telerikInput:RadColorPaletteView>
                                <telerikInput:RadColorPaletteView Grid.Row="3" Margin="0 5 0 2"
                                        x:Name="MainPalette"
                                        ItemContainerStyle="{TemplateBinding MainPaletteItemsStyle}"
                                        BorderBrush="Transparent" BorderThickness="0"
                                        Background="{TemplateBinding Background}" />
                                <Border Margin="0 2 0 3" x:Name="StandardPaletteBorder" Grid.Row="4"
                                        Background="{StaticResource ColorPicker_TitleBackground}"
                                        BorderBrush="{StaticResource ColorPicker_TitleBorder}"
                                        BorderThickness="0 0 0 1">
                                    <TextBlock Margin="10,2,2,2" x:Name="standardPaletteHeader"
                                            FontWeight="{TemplateBinding FontWeight}"
                                            Foreground="{TemplateBinding Foreground}"
                                            Text="{TemplateBinding StandardPaletteHeaderText}" />
                                </Border>
                                <telerikInput:RadColorPaletteView x:Name="StandartPalette"
                                        Margin="0 0 0 1" VerticalAlignment="Center" Grid.Row="5"
                                        BorderBrush="Transparent" BorderThickness="0"
                                        Background="{TemplateBinding Background}">
                                    <telerikInput:RadColorPaletteView.ItemsPanel>
                                        <ItemsPanelTemplate>
                                            <primitives:RadUniformGrid Background="Transparent"
                                                    Columns="10">
                                            </primitives:RadUniformGrid>
                                        </ItemsPanelTemplate>
                                    </telerikInput:RadColorPaletteView.ItemsPanel>
                                </telerikInput:RadColorPaletteView>
                            </Grid>
                        </Border>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <Style TargetType="telerikInput:RadColorPicker"
        x:Key="{telerik:ThemeResourceKey ThemeType=customTheme:BlackTheme, ElementType=telerikInput:RadColorPicker}">
        <Style.Setters>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="telerikInput:RadColorPicker">
                        <Grid x:Name="Root"
                                HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                                VerticalAlignment="{TemplateBinding VerticalAlignment}">
                            <Grid x:Name="Placement" Width="34">
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="23" />
                                    <ColumnDefinition Width="Auto" />
                                </Grid.ColumnDefinitions>

                                <Border x:Name="Over_back" Opacity="0" Height="25" CornerRadius="1"
                                        Background="{StaticResource ColorPicker_ButtonBackground_MouseOver}"
                                        BorderBrush="{StaticResource ColorPicker_ButtonBorder_MouseOver}"
                                        BorderThickness="1" Width="34" Grid.ColumnSpan="2">
                                    <Border CornerRadius="0" BorderThickness="1"
                                            BorderBrush="{StaticResource ColorPicker_ButtonInnerBorder_MouseOver}" />
                                </Border>

                                <Button x:Name="LeftButton"
                                        Style="{TemplateBinding ColorButtonStyle}"
                                        HorizontalContentAlignment="Center" />

                                <ToggleButton Grid.Column="1" x:Name="ToggleButtonElement"
                                    IsChecked="{Binding Path=IsDropDownOpen,Mode=TwoWay,RelativeSource={RelativeSource TemplatedParent}}"
                                    Style="{TemplateBinding ExpanderButtonStyle}" Cursor="Hand" />
                            </Grid>

                            <Popup x:Name="PART_Popup"
                                AllowsTransparency="True" StaysOpen="False"
                                IsOpen="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource TemplatedParent}}"
                                PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}">
                                <Grid>
                                    <Border x:Name="DropDownBorder">
                                        <telerikInput:RadColorSelector x:Name="ColorSelector"
                                                MainPaletteItemsStyle="{TemplateBinding MainPaletteItemsStyle}"
                                                MainPaletteColumnsCount="{TemplateBinding MainPaletteColumnsCount}"
                                                MainPaletteOrientation="{TemplateBinding MainPaletteOrientation}"
                                                MainPaletteHeaderText="{TemplateBinding MainPaletteHeaderText}"
                                                MainPalette="{TemplateBinding MainPalette}"
                                                HeaderPalette="{TemplateBinding HeaderPalette}"
                                                HeaderPaletteVisibility="{TemplateBinding HeaderPaletteVisibility}"
                                                StandardPalette="{TemplateBinding StandardPalette}"
                                                StandardPaletteVisibility="{TemplateBinding StandardPaletteVisibility}"
                                                StandardPaletteHeaderText="{TemplateBinding StandardPaletteHeaderText}"
                                                NoColorText="{TemplateBinding NoColorText}"
                                                BorderBrush="{TemplateBinding BorderBrush}"
                                                BorderThickness="{TemplateBinding BorderThickness}"
                                                NoColorVisibility="{TemplateBinding NoColorVisibility}"
                                                SelectedColor="{TemplateBinding SelectedColor}"
                                                Background="{TemplateBinding Background}"
                                                FontWeight="{TemplateBinding FontWeight}"
                                                FontStyle="{TemplateBinding FontStyle}"
                                                Foreground="{TemplateBinding Foreground}" />

                                    </Border>
                                </Grid>
                            </Popup>

                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter Property="Opacity" TargetName="Over_back" Value="1" />
                            </Trigger>
                            <Trigger Property="IsChecked" Value="True"
                                    SourceName="ToggleButtonElement">
                                <Setter Property="Opacity" TargetName="Over_back" Value="1" />
                            </Trigger>
                            <Trigger Property="IsFocused" Value="True" />
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Setter Property="MainPaletteColumnsCount" Value="10" />
            <Setter Property="MainPaletteOrientation" Value="Vertical" />
            <Setter Property="MainPalette" Value="Office" />
            <Setter Property="HeaderPaletteVisibility" Value="Visible" />
            <Setter Property="StandardPaletteVisibility" Value="Visible" />
            <Setter Property="NoColorVisibility" Value="Visible" />
            <Setter Property="SelectedColor" Value="Black" />
            <Setter Property="StandardPalette" Value="Standard" />
            <Setter Property="HeaderPalette" Value="Office" />
            <Setter Property="MainPaletteItemsStyle" Value="{StaticResource DefaultStyle}" />
            <Setter Property="ColorButtonStyle" Value="{StaticResource ColorButtonDefaultStyle}" />
            <Setter Property="ExpanderButtonStyle" Value="{StaticResource ToggleButtonIconStyle}" />
            <Setter Property="HorizontalAlignment" Value="Left" />
            <Setter Property="VerticalAlignment" Value="Top" />
            <Setter Property="Background" Value="{StaticResource ColorPicker_Background}" />
            <Setter Property="BorderBrush" Value="{StaticResource ColorPicker_OuterBorder}" />
            <Setter Property="BorderThickness" Value="1" />
            <Setter Property="FontStyle" Value="Normal" />
            <Setter Property="FontWeight" Value="Bold" />
            <Setter Property="Foreground" Value="{StaticResource ColorPicker_Foreground}" />
        </Style.Setters>
    </Style>
</ResourceDictionary>

[Dimitrina]

Hello Mikhailo,

Please, accept our apologies for this inconvenience.
This issues was added to our public issue tracking system and will be fixed as soon as possible. 

Your Telerik points have been updated.

All the best,
Dimitrina
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.

[Raj Yennam]

I also facing the same issue, could you provide me the fix ?
Note: I have upgraded to latest version (Q2 2012) of Silverlight controls 

[Vanya Pavlova]

Hello Raj,

 


Please follow these steps when dealing with custom theme in our newest version (for SL): 
1. Create a new Class LIbrary named MyTheme and add the following piece of code within MyTheme.cs: 

[ThemeLocation(ThemeLocation.BuiltIn)]
   public class MyTheme : Theme
   {
       public MyTheme()
       {
           this.Source = new Uri("/MyTheme;component/themes/Generic.xaml", UriKind.RelativeOrAbsolute);
       }
   }

2. Add a new Themes folder with the corresponding ResourceDictionaries for RadGridView (located on..\Q2 2012 SP1\ Official\Silverlight\Themes\..\Expression_Dark):
System.Windows.xaml, Telerik.Windows.Controls.xaml, Telerik.Windows.Controls.Input.xaml, Telerik.Windows.Controls.GridView.xaml.


3.Specify the namespace for this theme and the Key for your theme in all ResourceDictionaries as follows:   

xmlns:external="clr-namespace:MyTheme"
<local:MyTheme x:Key="Theme" />

You may find attached sample application which illustrates this approach.  
I have tried to reproduce an error with RadColorPicker, however with no avail. Will you please take a look at the attached project and let us know how it differs from yours? 


All the best,
Vanya Pavlova
the Telerik team