Top-Level Header disappears when clicked to open

[Brew Hutch]

Hi,

I've updated DLLs to the latest version 2013.3.1016.40. When clicking the top-level header item, it disappears. I have to click and hold the mouse then the sub items will be displayed. This dose not happen to the previous version. 

XAML

<telerik:RadMenu x:Name="radMenu" ClickToOpen="True">
    <telerik:RadMenuItem  Header="File">
        <telerik:RadMenuItem  Header="Open"/>
        <telerik:RadMenuItem  Header="Exit"/>
    </telerik:RadMenuItem>
</telerik:RadMenu>

Style

<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:Telerik_Windows_Controls_Chromes="clr-namespace:Telerik.Windows.Controls.Chromes;assembly=Telerik.Windows.Controls"
    xmlns:telerikbase="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls">

    <SolidColorBrush x:Key="MenuBackground" Color="#FF494A4D" />
    <LinearGradientBrush x:Key="MenuBorder" EndPoint="1,0.5" StartPoint="0.0,0.5">
        <GradientStop Color="#FF707070" Offset="0"/>
        <GradientStop Color="#FF707070" Offset="1"/>
        <GradientStop Color="#FFA3A3A3" Offset="0.5"/>
    </LinearGradientBrush>

    <SolidColorBrush x:Key="MenuForeground_Normal" Color="#FF262626" />
    <SolidColorBrush x:Key="MenuForeground_MouseOver" Color="#FF262626" />

    <SolidColorBrush x:Key="MenuBackground_MouseOver" Color="Transparent" />
    <LinearGradientBrush x:Key="MenuBorder_MouseOver" EndPoint="1,0.5" StartPoint="0,0.5">
        <GradientStop Color="#FF707070" Offset="0"/>
        <GradientStop Color="#FF707070" Offset="1"/>
        <GradientStop Color="#FFA3A3A3" Offset="0.5"/>
    </LinearGradientBrush>

    <SolidColorBrush x:Key="MenuBackground_Highlighted" Color="Blue" />
    <SolidColorBrush x:Key="MenuForeground_Highlighted" Color="#FF262626" />

    <SolidColorBrush x:Key="PopupBorder" Color="#FF595959" />
    <SolidColorBrush x:Key="PopupBackground" Color="White" />


    <!--SeparatorTemplate  -->
    <ControlTemplate TargetType="telerik:RadMenuItem" x:Key="SeparatorTemplate">
        <Rectangle Fill="{StaticResource PopupBorder}" Height="1" Margin="3" />
    </ControlTemplate>

    <!-- TopLevelItem -->
    <ControlTemplate x:Key="TopLevelItemTemplate" TargetType="telerik:RadMenuItem">
        <Grid x:Name="RootElement" Margin="1">

            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Disabled">
                        <Storyboard>
                            <DoubleAnimation Duration="0" To="0.27" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="RootElement" />
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Normal" />
                    <VisualState x:Name="Highlighted">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Header" Storyboard.TargetProperty="Foreground">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_MouseOver}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Tick" Storyboard.TargetProperty="Fill">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_MouseOver}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Highlight" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
                <VisualStateGroup x:Name="FocusStates">
                    <VisualState x:Name="Unfocused" />
                    <VisualState x:Name="Focused" />
                </VisualStateGroup>
                <VisualStateGroup x:Name="CheckStates">
                    <VisualState x:Name="Checked">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Tick" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Unchecked" />
                    <VisualState x:Name="HideIcon">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>


            <Border x:Name="Background" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" />
            <Border x:Name="Highlight" Visibility="Collapsed" Background="{StaticResource MenuBackground_MouseOver}" BorderBrush="{StaticResource MenuBorder_MouseOver}" BorderThickness="{TemplateBinding BorderThickness}" />

            <Border Margin="3 0 0 0">
                <Grid x:Name="ContentGrid" Margin="{TemplateBinding Padding}">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>

                    <Path x:Name="Tick" Margin="0 0 4 0" Grid.Column="0" Visibility="Collapsed" VerticalAlignment="Center" FlowDirection="LeftToRight"
                          Fill="{StaticResource MenuForeground_Normal}" Data="M0,3 4,7 8,0 6.3,0 3.8,4.9 2,2.7 z" Width="8" Height="7" />
                    <ContentPresenter x:Name="Icon" Margin="0 -2 2 -2" Grid.Column="0" Content="{TemplateBinding Icon}" ContentTemplate="{TemplateBinding IconTemplate}" />

                    <ContentControl x:Name="Header" Grid.Column="1" Foreground="{StaticResource MenuForeground_Normal}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
                </Grid>
            </Border>
        </Grid>

    </ControlTemplate>

    <!-- TopLevelHeader -->
    <ControlTemplate x:Key="TopLevelHeaderTemplate" TargetType="telerik:RadMenuItem">
        <Grid x:Name="RootElement" Margin="1">

            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Disabled">
                        <Storyboard>
                            <DoubleAnimation Duration="0" To="0.27" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="RootElement" />
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Normal" />
                    <VisualState x:Name="Highlighted">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Header" Storyboard.TargetProperty="Foreground">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_MouseOver}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Tick" Storyboard.TargetProperty="Fill">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_MouseOver}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Highlight" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
                <VisualStateGroup x:Name="FocusStates">
                    <VisualState x:Name="Unfocused" />
                    <VisualState x:Name="Focused" />
                </VisualStateGroup>
                <VisualStateGroup x:Name="CheckStates">
                    <VisualState x:Name="Checked">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Tick" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Unchecked" />
                    <VisualState x:Name="HideIcon">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>

            <Border x:Name="Background" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" />
            <Border x:Name="Highlight" Visibility="Collapsed" Background="{StaticResource MenuBackground_MouseOver}" BorderBrush="{StaticResource MenuBorder_MouseOver}" BorderThickness="{TemplateBinding BorderThickness}" />

            <Border Margin="3 0 0 0">
                <Grid x:Name="ContentGrid" Margin="{TemplateBinding Padding}">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>

                    <Path x:Name="Tick" Margin="0 0 4 0" Grid.Column="0" Visibility="Collapsed" VerticalAlignment="Center" FlowDirection="LeftToRight"
                          Fill="{StaticResource MenuForeground_Normal}" Data="M0,3 4,7 8,0 6.3,0 3.8,4.9 2,2.7 z" Width="8" Height="7" />

                    <ContentPresenter x:Name="Icon" Margin="0 -2 2 -2" Grid.Column="0" Content="{TemplateBinding Icon}" ContentTemplate="{TemplateBinding IconTemplate}"/>
                    <ContentControl x:Name="Header" Grid.Column="1" Foreground="{StaticResource MenuForeground_Normal}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
                </Grid>
            </Border>


            <Popup x:Name="PART_Popup" IsOpen="{TemplateBinding IsSubmenuOpen}" Focusable="false">


                <Border BorderThickness="1" BorderBrush="{StaticResource PopupBorder}" Background="{StaticResource PopupBackground}">
                    <ItemsPresenter Margin="1" />
                </Border>
            </Popup>
        </Grid>

    </ControlTemplate>

    <!-- SubMenuItem -->
    <ControlTemplate x:Key="SubMenuItemTemplate" TargetType="telerik:RadMenuItem">
        <Grid x:Name="RootElement">

            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Disabled">
                        <Storyboard>
                            <DoubleAnimation Duration="0" To="0.27" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="RootElement" />
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Normal" />
                    <VisualState x:Name="Highlighted">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Header" Storyboard.TargetProperty="Foreground">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_Highlighted}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Tick" Storyboard.TargetProperty="Fill">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_Highlighted}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Highlight" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
                <VisualStateGroup x:Name="FocusStates">
                    <VisualState x:Name="Unfocused" />
                    <VisualState x:Name="Focused" />
                </VisualStateGroup>
                <VisualStateGroup x:Name="CheckStates">
                    <VisualState x:Name="Checked">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Tick" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Unchecked" />
                    <VisualState x:Name="HideIcon">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>


            <Border x:Name="Background" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" />
            <Rectangle x:Name="Highlight" Visibility="Collapsed" Fill="{StaticResource MenuBackground_Highlighted}" />

            <Grid x:Name="ContentGrid">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Grid Width="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Menu.IconColumnWidth}">
                    <Path x:Name="Tick" Grid.Column="0" Visibility="Collapsed" VerticalAlignment="Center" HorizontalAlignment="Center" FlowDirection="LeftToRight"
                          Fill="{StaticResource MenuForeground_Normal}" Data="M0,3 4,7 8,0 6.3,0 3.8,4.9 2,2.7 z" Width="8" Height="7" />
                    <ContentPresenter x:Name="Icon" Grid.Column="0" Margin="0 -2 2 -2" Content="{TemplateBinding Icon}" ContentTemplate="{TemplateBinding IconTemplate}" />
                </Grid>
                <ContentControl x:Name="Header" Grid.Column="1" Margin="{TemplateBinding Padding}" Foreground="{StaticResource MenuForeground_Normal}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
            </Grid>
        </Grid>

    </ControlTemplate>

    <!-- SubMenuHeader -->
    <ControlTemplate x:Key="SubMenuHeaderTemplate" TargetType="telerik:RadMenuItem">
        <Grid x:Name="RootElement">

            <VisualStateManager.VisualStateGroups>
                <VisualStateGroup x:Name="CommonStates">
                    <VisualState x:Name="Highlighted">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Header" Storyboard.TargetProperty="Foreground">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_Highlighted}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ExpandIcon" Storyboard.TargetProperty="Fill">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="{StaticResource MenuForeground_Highlighted}" />
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Background" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Highlight" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Visible</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Disabled">
                        <Storyboard>
                            <DoubleAnimation Duration="0" To="0.27" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="RootElement" />
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Normal" />
                </VisualStateGroup>
                <VisualStateGroup x:Name="FocusStates">
                    <VisualState x:Name="Unfocused" />
                    <VisualState x:Name="Focused" />
                </VisualStateGroup>
                <VisualStateGroup x:Name="CheckStates">
                    <VisualState x:Name="Checked">
                        <Storyboard>
                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Icon" Storyboard.TargetProperty="Visibility">
                                <DiscreteObjectKeyFrame KeyTime="0:0:0">
                                    <DiscreteObjectKeyFrame.Value>
                                        <Visibility>Collapsed</Visibility>
                                    </DiscreteObjectKeyFrame.Value>
                                </DiscreteObjectKeyFrame>
                            </ObjectAnimationUsingKeyFrames>
                        </Storyboard>
                    </VisualState>
                    <VisualState x:Name="Unchecked" />
                    <VisualState x:Name="HideIcon" />
                </VisualStateGroup>
            </VisualStateManager.VisualStateGroups>

            <Border x:Name="Background" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" />
            <Rectangle x:Name="Highlight" Visibility="Collapsed" Fill="{StaticResource MenuBackground_Highlighted}" />

            <Grid>

                <Grid x:Name="ContentGrid">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="Auto" />
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="Auto" />
                    </Grid.ColumnDefinitions>

                    <Grid Width="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Menu.IconColumnWidth}">
                        <ContentPresenter x:Name="Icon" Margin="0 -2 2 -2" Content="{TemplateBinding Icon}" ContentTemplate="{TemplateBinding IconTemplate}" />
                    </Grid>
                    <ContentControl x:Name="Header" Grid.Column="1" Margin="{TemplateBinding Padding}" Foreground="{StaticResource MenuForeground_Normal}" Content="{TemplateBinding Header}" ContentTemplate="{TemplateBinding HeaderTemplate}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" />
                    <Path x:Name="ExpandIcon" Grid.Column="2" Margin="6 0" Fill="{StaticResource MenuForeground_Normal}" VerticalAlignment="Center" Width="5" Height="5" Data="M0,0 L5,2.5 0,5Z" />
                </Grid>
            </Grid>


            <Popup x:Name="PART_Popup" IsOpen="{TemplateBinding IsSubmenuOpen}" Focusable="false">


                <Border BorderThickness="1" BorderBrush="{StaticResource PopupBorder}" Background="{StaticResource PopupBackground}">
                    <ItemsPresenter Margin="1" />
                </Border>
            </Popup>
        </Grid>

    </ControlTemplate>

    <Style x:Key="RadMenuItemStyle" TargetType="{x:Type telerik:RadMenuItem}">
        <Setter Property="Padding" Value="6,2"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="BorderBrush" Value="#FF848484"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="TopLevelHeaderTemplateKey" Value="{StaticResource TopLevelHeaderTemplate}" />
        <Setter Property="TopLevelItemTemplateKey" Value="{StaticResource TopLevelItemTemplate}" />
        <Setter Property="SubmenuHeaderTemplateKey" Value="{StaticResource SubMenuHeaderTemplate}" />
        <Setter Property="SubmenuItemTemplateKey" Value="{StaticResource SubMenuItemTemplate}" />

        <Setter Property="SeparatorTemplateKey" Value="{StaticResource SeparatorTemplate}" />

        <Setter Property="Template" Value="{StaticResource SubMenuItemTemplate}" />

        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="SnapsToDevicePixels" Value="True"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>

        <Style.Triggers>
            <Trigger Property="Role" Value="TopLevelHeader">
                <Setter Property="Template" Value="{StaticResource TopLevelHeaderTemplate}" />
            </Trigger>
            <Trigger Property="Role" Value="TopLevelItem">
                <Setter Property="Template" Value="{StaticResource TopLevelItemTemplate}" />
            </Trigger>
            <Trigger Property="Role" Value="SubmenuHeader">
                <Setter Property="Template" Value="{StaticResource SubMenuHeaderTemplate}" />
            </Trigger>
            <Trigger Property="Role" Value="SubmenuItem">
                <Setter Property="Template" Value="{StaticResource SubMenuItemTemplate}" />
            </Trigger>
            <Trigger Property="Role" Value="Separator">
                <Setter Property="Template" Value="{StaticResource SeparatorTemplate}" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <!-- RadMenu -->
    <ControlTemplate x:Key="RadMenuControlTemplate" TargetType="telerik:RadMenu">
        <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
            <ItemsPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="{TemplateBinding Padding}" />
        </Border>
    </ControlTemplate>

    <ItemsPanelTemplate x:Key="RadMenuItemsPanelTemplate">
        <telerik:RadWrapPanel />
    </ItemsPanelTemplate>

    <Style TargetType="{x:Type telerik:RadMenu}">
        <Setter Property="IconColumnWidth" Value="0" />
        <Setter Property="Padding" Value="0" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="BorderBrush" Value="{StaticResource MenuBorder}" />
        <Setter Property="Background" Value="{StaticResource MenuBackground}" />
        <Setter Property="ItemsPanel" Value="{StaticResource RadMenuItemsPanelTemplate}" />
        <Setter Property="Template" Value="{StaticResource RadMenuControlTemplate}" />
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="ItemContainerStyle" Value="{StaticResource RadMenuItemStyle}" />
        <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    </Style>
</ResourceDictionary>

Thanks,
Brew

[Rosen Vladimirov]

Hi Brew,

The resource dictionary that you are merging is using our old styles - we have changed RadMenuItem's Implicit Style and using the old one is causing the problem. You can take a look at our new Style inside Telerik.Windows.Controls.Navigation.xaml under <RadControls_Installation_Dir>\Themes.Implicit\WPF40\OfficeBlack directory.

Hopefully this helps. Feel free to contact us in case you have any other problems or concerns.

Regards,
Rosen Vladimirov
Telerik