Hello!

I just upgraded my application to the Q2 release of telerik WPF controls and found that RadDocking throws an unhandled exception when dropping panes into a pane that is not the center (e.g. not into the existing radpanegroup). After some debugging, I figured this only happens with the Windows7Theme set. I reproduced the same problem in a simple WPF application, which I can supply if required (Basically a barebones wpf application with code from the docking example and the Windows7Theme set in the App constructor).

System.InvalidOperationException was unhandled
  Message=Element already has a logical parent. It must be detached from the old parent before it is attached to a new one.
  Source=PresentationFramework
  StackTrace:
       at MS.Internal.Controls.InnerItemCollectionView.AssertPristineModelChild(Object item)
       at MS.Internal.Controls.InnerItemCollectionView.Insert(Int32 index, Object item)
       at System.Windows.Controls.ItemCollection.Insert(Int32 insertIndex, Object insertItem)
       at Telerik.Windows.Controls.RadSplitContainer.AddItem(ISplitItem item, DockPosition dockPosition, ISplitItem relativeTo) in c:\TB\102\WPF_Scrum\Release_WPF_40\Sources\Development\Controls\Docking\Docking\Docking\RadSplitContainer.cs:line 373
       at Telerik.Windows.Controls.RadPaneGroup.AddItem(ISplitItem item, DockPosition dockPosition) in c:\TB\102\WPF_Scrum\Release_WPF_40\Sources\Development\Controls\Docking\Docking\Docking\RadPaneGroup.cs:line 382
       at Telerik.Windows.Controls.RadDocking.OnDropContainer(RadSplitContainer container, Point globalMousePosition) in c:\TB\102\WPF_Scrum\Release_WPF_40\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 338
       at Telerik.Windows.Controls.RadDocking.DropWindow(ToolWindow toolWindow, Point globalMousePosition) in c:\TB\102\WPF_Scrum\Release_WPF_40\Sources\Development\Controls\Docking\Docking\Docking\RadDocking.cs:line 269

Kind Regards,
Karin Huber

Edit: Sorry, I have mistakenly posted this to the Silverlight RadDocking instead of the WPF RadDocking forum. I have not tried if the same thing happens for silverlight...

Hi Karin,

We are aware of this issue. A fix will be provided in the next internal build.
Sorry for the caused inconvenience.

Greetings,
Konstantina
the Telerik team

Hi,
just to let your test engineers know:
the same exception is thrown - without setting any theme - if you start your docking without a document host and all docking panes hidden.
If you then try to show  - let's say in mainwindow_loaded() - pane1, with
pane1.hidden = false
the InnerException comes up with this message.

Again, this is for WPF Q2 Nightly 2011.2.1010.40
all the best
Hermann

Hi Hermann,

Could you please send us a sample project in which this issue can be observed? In that way we will be able to fix it in a timely manner.
Appreciate your help.

Greetings,
Konstantina
the Telerik team

Here is a condensed project which shows the issue...
It is a zip file hidden as png - I hope this will do.
You might set an environment var named TELERIK_WPF_HOME to load the project

Kind regards,
Hermann

Hello Hermann,

Sorry, but the attachment is missing. Could you please open a support ticket and attached it there.

Looking forward to your reply.

Regards,
Konstantina
the Telerik team

Hi, it's already being sent as support ticket 480178.