Internal Null Reference in RadDocking

3 posts, 1 answers
  1. Eric
    Eric avatar
    48 posts
    Member since:
    Jul 2012

    Posted 10 Jul 2012 Link to this post

    Hello,

    I have dock that starts out docked right.  When I undock it, and try to add it to the document host (center) on the right side, I get a null reference exception before I even realease the mouse.  The exception detail is listed below, as well as a shortened version of the docking I am using.  Any idea why this might happen?

    EDIT: Using Q2, WPF, .Net 4.0

    Thanks,
    Eric

    <telerik:RadDocking Grid.Row="1" x:Name="radDock"
                                telerikQuickStart:ThemeAwareBackgroundBehavior.IsEnabled="True"
                                BorderThickness="0"  Padding="0" Visibility="Hidden">
                <telerik:RadDocking.DocumentHost>
                    <telerik:RadPaneGroup x:Name="MainGroup">
                        <telerik:RadPane x:Name="GanttPane" Header="Build Directories" ContextMenuTemplate="{x:Null}">
                            <Grid>
                           </Grid>
                        </telerik:RadPane>
                    </telerik:RadPaneGroup>
                </telerik:RadDocking.DocumentHost>
                <telerik:RadSplitContainer telerik:DockingPanel.InitialSize="300,800" x:Name="RightContainer" InitialPosition="DockedRight">
                    <telerik:RadPaneGroup x:Name="RightGroup">
                        <telerik:RadPane x:Name="DirInfoPane" Header="Directory Information" IsHidden="True">
                            <ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled">
                            </ListBox>
                        </telerik:RadPane>
                    </telerik:RadPaneGroup>
                </telerik:RadSplitContainer>
    </telerik:RadDocking>


    System.NullReferenceException was unhandled
      HResult=-2147467261
      Message=Object reference not set to an instance of an object.
      Source=Telerik.Windows.Controls.Docking
      StackTrace:
           at Telerik.Windows.Controls.RadDocking.GetElementPositionAtScreenRoot(FrameworkElement element) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 1473
           at Telerik.Windows.Controls.RadDocking.GetCuePosition(RadPaneGroup targetGroup, DockPosition position, Size draggedElementRelativeSize) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 1370
           at Telerik.Windows.Controls.RadDocking.AdjustCueSizeAndLocation(Size draggedElementRelativeSize, Size draggedElementInitialSize) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 1385
           at Telerik.Windows.Controls.RadDocking.OnDragContainer(RadSplitContainer container, Point globalMousePosition) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 389
           at Telerik.Windows.Controls.RadDocking.OnToolWindowDrag(ToolWindow window, Point globalMousePosition) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 276
           at Telerik.Windows.Controls.Docking.ToolWindow.OnDragDelta(Point globalMousePosition, Rect initialRect, Rect destinationRect, Boolean isResize) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Docking\Docking\Parts\ToolWindow.cs:line 522
           at Telerik.Windows.Controls.WindowBase.Telerik.Windows.Controls.InternalWindow.IDragAware.OnDragDelta(Point globalMousePosition, Rect initialRect, Rect destinationRect, Boolean isResize) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\WindowBase.cs:line 1267
           at Telerik.Windows.Controls.InternalWindow.WindowHostBase.OnDragDelta(Point globalMousePosition, Rect initialRect, Rect destinationRect, Boolean isResize) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\WindowHostBase.cs:line 85
           at Telerik.Windows.Controls.InternalWindow.ChromelessWindowHelper.OnWindowPositionUpdating(Rect windowPosition) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\WindowChrome\ChromelessWindowHelper.cs:line 350
           at Telerik.Windows.Controls.InternalWindow.ChromelessWindowHelper.HandleMoving(IntPtr hwnd, IntPtr wParam, IntPtr lParam, Boolean& handled) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\WindowChrome\ChromelessWindowHelper.cs:line 551
           at Telerik.Windows.Controls.InternalWindow.ChromelessWindowHelper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) in c:\TB\117\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\InternalWindow\WindowChrome\ChromelessWindowHelper.cs:line 857
           at System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
           at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
           at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
           at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
           at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
           at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
           at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
      InnerException:
  2. Answer
    Georgi
    Admin
    Georgi avatar
    348 posts

    Posted 12 Jul 2012 Link to this post

    Hi Eric,

    It seems that you need SplitContainer in the DocumentHost. It would be great if you can give it a try and let us know if this works for you:
    <telerik:RadDocking.DocumentHost>
                    <telerik:RadSplitContainer>
                    <telerik:RadPaneGroup x:Name="MainGroup">
                        <telerik:RadPane x:Name="GanttPane" Header="Build Directories" ContextMenuTemplate="{x:Null}">
                            <Grid>
                           </Grid>
                        </telerik:RadPane>
                    </telerik:RadPaneGroup>
                    </telerik:RadSplitContainer>
                </telerik:RadDocking.DocumentHost>



    Regards,
    Georgi
    the Telerik team

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  4. Eric
    Eric avatar
    48 posts
    Member since:
    Jul 2012

    Posted 12 Jul 2012 Link to this post

    Yes, that solved it.  Thanks!

    Eric
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