Type reference cannot find type named '{http://schemas.telerik.com/2008/xaml/presentation}GridViewHeaderCell'.

[Alex]

Hello. I want to change style for HeaderCell and add check box for IsVisible property. I had extracted header style in blend to ResourceDictionary. Then i added this ResourceDictionary to App resources. Designer and blend draw style correct, but on start up i get exception:
'Failed to create a 'Type' from the text 'telerik:GridViewHeaderCell'.'  with message - Type reference cannot find type named '{http://schemas.telerik.com/2008/xaml/presentation}GridViewHeaderCell'.

Does anybody know what i'm doing wrong?

Version of dlls - 2012_2_0716

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <!-- Resource dictionary entries should be defined here. -->

    <Style x:Key="GridViewHeaderCellStyle" TargetType="{x:Type telerik:GridViewHeaderCell}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type telerik:GridViewHeaderCell}">
                    <Grid x:Name="PART_HeaderCellGrid">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="auto"/>
                            <ColumnDefinition Width="0.1*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualStateGroup.Transitions>
                                    <VisualTransition From="{x:Null}" GeneratedDuration="0:0:0.2" GeneratedEasingFunction="{x:Null}" Storyboard="{x:Null}" To="Normal"/>
                                    <VisualTransition From="{x:Null}" GeneratedDuration="0:0:0.2" GeneratedEasingFunction="{x:Null}" Storyboard="{x:Null}" To="MouseOver"/>
                                </VisualStateGroup.Transitions>
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="MouseOver">
                                    <Storyboard>
                                        <DoubleAnimationUsingKeyFrames BeginTime="0" Duration="0:0:0.001" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="GridViewHeaderCell_Over">
                                            <DiscreteDoubleKeyFrame KeyTime="0" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames BeginTime="0" Duration="0:0:0.001" Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <SolidColorBrush Color="Black"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Ascending">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames BeginTime="0" Duration="0:0:0.001" Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <SolidColorBrush Color="Black"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_SortIndicator">
                                            <DiscreteDoubleKeyFrame KeyTime="0" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="GridViewHeaderCell_Selected">
                                            <DiscreteDoubleKeyFrame KeyTime="0" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Descending">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames BeginTime="0" Duration="0:0:0.001" Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <SolidColorBrush Color="Black"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_SortIndicator">
                                            <DiscreteDoubleKeyFrame KeyTime="0" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="RenderTransform" Storyboard.TargetName="PART_SortIndicator">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <ScaleTransform ScaleY="1" ScaleX="1"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="GridViewHeaderCell_Selected">
                                            <DiscreteDoubleKeyFrame KeyTime="0" Value="1"/>
                                        </DoubleAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="GridViewHeaderCell" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Grid.ColumnSpan="2">
                            <Border BorderBrush="#FF4B4B4B" BorderThickness="1" Background="{TemplateBinding Background}"/>
                        </Border>
                        <Border x:Name="GridViewHeaderCell_Over" BorderBrush="#FFFFC92B" BorderThickness="{TemplateBinding BorderThickness}" Grid.ColumnSpan="2" Opacity="0">
                            <Border BorderBrush="White" BorderThickness="1">
                                <Border.Background>
                                    <LinearGradientBrush 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>
                                </Border.Background>
                            </Border>
                        </Border>
                        <Border x:Name="GridViewHeaderCell_Selected" BorderThickness="{TemplateBinding BorderThickness}" Grid.ColumnSpan="2" Opacity="0">
                            <Border.BorderBrush>
                                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                    <GradientStop Color="#FF616161" Offset="0"/>
                                    <GradientStop Color="#FF989898" Offset="1"/>
                                </LinearGradientBrush>
                            </Border.BorderBrush>
                            <Border BorderThickness="1">
                                <Border.BorderBrush>
                                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                        <GradientStop Color="#FFB69A78"/>
                                        <GradientStop Color="#FFFFE17A" Offset="0.126"/>
                                    </LinearGradientBrush>
                                </Border.BorderBrush>
                                <Border.Background>
                                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                                        <GradientStop Color="#FFFFD74E" Offset="0.996"/>
                                        <GradientStop Color="#FFFFDCAB" Offset="0.17"/>
                                        <GradientStop Color="#FFFFB062" Offset="0.57"/>
                                        <GradientStop Color="#FFFFD18F" Offset="0.56"/>
                                        <GradientStop Color="#FFFFBA74"/>
                                    </LinearGradientBrush>
                                </Border.Background>
                            </Border>
                        </Border>
                        <CheckBox Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="2,1,1,1" IsChecked="{TemplateBinding IsVisible}" />
                        <ContentControl x:Name="ContentPresenter" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="1" Foreground="{TemplateBinding Foreground}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsTabStop="{TemplateBinding IsTabStop}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                            <ContentControl.Style>
                                <Style TargetType="{x:Type ContentControl}">
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ContentControl.Style>
                        </ContentControl>
                        <Path x:Name="PART_SortIndicator" Grid.ColumnSpan="2" Data="M0,0L1,0 2,0 3,0 4,0 5,0 5,1 4,1 4,2 3,2 3,3 2,3 2,2 1,2 1,1 0,1 0,0z" Fill="Black" HorizontalAlignment="Center" Height="3" Margin="0,3,0,0" Opacity="0" RenderTransformOrigin="0.5,0.5" Stretch="Fill" VerticalAlignment="Top" Width="5">
                            <Path.RenderTransform>
                                <TransformGroup>
                                    <ScaleTransform ScaleY="-1" ScaleX="1"/>
                                    <SkewTransform AngleY="0" AngleX="0"/>
                                    <RotateTransform Angle="0"/>
                                    <TranslateTransform X="0" Y="0"/>
                                </TransformGroup>
                            </Path.RenderTransform>
                        </Path>
                        <telerik:FilteringDropDown x:Name="PART_DistinctFilterControl" Grid.Column="1" IsTabStop="False" Margin="0,0,8,0" Visibility="{TemplateBinding FilteringUIVisibility}">
                            <telerik:StyleManager.Theme>
                                <telerik:Office_BlackTheme/>
                            </telerik:StyleManager.Theme>
                        </telerik:FilteringDropDown>
                        <Thumb x:Name="PART_LeftHeaderGripper" Grid.ColumnSpan="2" HorizontalAlignment="Left" IsTabStop="{TemplateBinding IsTabStop}">
                            <Thumb.Style>
                                <Style TargetType="{x:Type Thumb}">
                                    <Setter Property="Width" Value="8"/>
                                    <Setter Property="Background" Value="Transparent"/>
                                    <Setter Property="BorderBrush" Value="Transparent"/>
                                    <Setter Property="BorderThickness" Value="0"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
                                    <Setter Property="Padding" Value="0"/>
                                    <Setter Property="Cursor" Value="SizeWE"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="{x:Type Thumb}">
                                                <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </Thumb.Style>
                        </Thumb>
                        <Thumb x:Name="PART_RightHeaderGripper" Grid.ColumnSpan="2" HorizontalAlignment="Right" IsTabStop="{TemplateBinding IsTabStop}">
                            <Thumb.Style>
                                <Style TargetType="{x:Type Thumb}">
                                    <Setter Property="Width" Value="8"/>
                                    <Setter Property="Background" Value="Transparent"/>
                                    <Setter Property="BorderBrush" Value="Transparent"/>
                                    <Setter Property="BorderThickness" Value="0"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                    <Setter Property="VerticalContentAlignment" Value="Stretch"/>
                                    <Setter Property="Padding" Value="0"/>
                                    <Setter Property="Cursor" Value="SizeWE"/>
                                    <Setter Property="Template">
                                        <Setter.Value>
                                            <ControlTemplate TargetType="{x:Type Thumb}">
                                                <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                            </ControlTemplate>
                                        </Setter.Value>
                                    </Setter>
                                </Style>
                            </Thumb.Style>
                        </Thumb>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Setter Property="Background">
            <Setter.Value>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="#FF5B5B5B" Offset="1"/>
                    <GradientStop Color="#FF868686"/>
                    <GradientStop Color="#FF4F4F4F" Offset="0.42"/>
                    <GradientStop Color="#FF0E0E0E" Offset="0.43"/>
                </LinearGradientBrush>
            </Setter.Value>
        </Setter>
        <Setter Property="BorderBrush" Value="#FF848484"/>
        <Setter Property="BorderThickness" Value="0,0,1,1"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="Padding" Value="5,0,3,0"/>
        <Setter Property="Foreground" Value="White"/>
        <Setter Property="DropMarkPen">
            <Setter.Value>
                <Pen Brush="White" Thickness="2"/>
            </Setter.Value>
        </Setter>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
    </Style>
</ResourceDictionary>