"Unhandled exception" in telerik code when editing xaml/raddocking

[Anders]

I get the following exception when I paste from your WPF Controls Examples and reduce the contents of RadPanes (See xaml below).
Any suggestions for a way forward?

Anders, Denmark

Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.InternalWindow.PopupWindowHost.PopupHostManagerBase.GetManager(DependencyObject obj) in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\PopupWindowHost.cs:line 308
   at Telerik.Windows.Controls.InternalWindow.SinglePopupWindowHost.GetHostManager() in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\SinglePopupWindowHost.cs:line 22
   at Telerik.Windows.Controls.InternalWindow.PopupWindowHost.Open(Boolean isModal) in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\PopupWindowHost.cs:line 77
   at Telerik.Windows.Controls.WindowBase.ShowWindow(Boolean isModal) in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\WindowBase.cs:line 891
   at Telerik.Windows.Controls.Docking.ToolWindow.Open() in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Parts\ToolWindow.cs:line 121
   at Telerik.Windows.Controls.RadDocking.OpenInToolWindow(RadSplitContainer container) in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 797
   at Telerik.Windows.Controls.RadDocking.InitializeSplitContainer(RadSplitContainer container) in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 1325
   at Telerik.Windows.Controls.RadDocking.OnApplyTemplate() in c:\TB\135\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 180
   at System.Windows.FrameworkElement.ApplyTemplate()
   at Microsoft.Expression.Platform.WPF.WpfViewNodeManager.EnsureElementInDictionary(Object root, ViewNode knownAncestor)



<telerik:RadDocking x:Name="radDocking1" 

                    Grid.Row="1" Margin="0 0 0 10"

                    BorderThickness="0"

                    Padding="0" Background="{StaticResource LightGrayBrush}">

 

    <!--DocumentHost-->

    <telerik:RadDocking.DocumentHost>

        <telerik:RadSplitContainer>

            <telerik:RadPaneGroup>

                <telerik:RadDocumentPane Title="Description">

                </telerik:RadDocumentPane>

                <telerik:RadPane Header="NotDragable" CanFloat="False">

                </telerik:RadPane>

            </telerik:RadPaneGroup>

        </telerik:RadSplitContainer>

    </telerik:RadDocking.DocumentHost>

 

    <telerik:RadSplitContainer  MaxWidth="600" telerik:DockingPanel.InitialSize="210,150"

    Name="LeftContainer" InitialPosition="DockedLeft">

        <telerik:RadPaneGroup x:Name="Group1">

            <!--Server Exproler-->

            <telerik:RadPane x:Name="Pane1" Header="Server Explorer">

            </telerik:RadPane>

 

            <!--Toolbox-->

            <telerik:RadPane x:Name="Pane2" Header="Toolbox">

            </telerik:RadPane>

        </telerik:RadPaneGroup>

    </telerik:RadSplitContainer>

 

    <telerik:RadSplitContainer MaxWidth="679" telerik:DockingPanel.InitialSize="210,150"

    x:Name="RightContainer" InitialPosition="DockedRight">

        <telerik:RadPaneGroup x:Name="Group2">

 

            <!-- Solution Explorer -->

            <telerik:RadPane x:Name="Pane3" Header="Solution Explorer">

            </telerik:RadPane>

 

            <!--Properties-->

            <telerik:RadPane x:Name="Pane4" Header="Properties">

             </telerik:RadPane>

        </telerik:RadPaneGroup>

    </telerik:RadSplitContainer>

 

    <telerik:RadSplitContainer InitialPosition="FloatingDockable"

    telerik:RadDocking.FloatingLocation="450, 250"

    telerik:RadDocking.FloatingSize="300, 220">

        <telerik:RadPaneGroup>

            <telerik:RadPane Header="Not Document Pane" CanDockInDocumentHost="False">

             </telerik:RadPane>

        </telerik:RadPaneGroup>

    </telerik:RadSplitContainer>

 

    <telerik:RadSplitContainer telerik:DockingPanel.InitialSize="200,180"

    x:Name="BottomContainer" InitialPosition="DockedBottom">

        <telerik:RadPaneGroup x:Name="Group3">

 

            <!-- Output -->

            <telerik:RadPane x:Name="Pane5" Header="Output">

             </telerik:RadPane>

 

            <!--Error List-->

            <telerik:RadPane x:Name="Pane6" Header="Error List">

             </telerik:RadPane>

        </telerik:RadPaneGroup>

    </telerik:RadSplitContainer>

</telerik:RadDocking>

[Anders]

Update -- removing
Background="{StaticResource LightGrayBrush}"
removed the unhandled exception.