After update version NullReference in UpdatePositionHelper !

[alexhome]

After update version to 2011.2.920.1040 from 2011.1.xx.xx, i got error:
+ $exception {System.NullReferenceException: Object reference not set to an instance of an object.
at Telerik.Windows.Controls.Docking.ToolWindow.UpdatePositionHelper(PositionHelper helper)
at Telerik.Windows.Controls.WindowBase.CheckRestrictedArea()
at Telerik.Windows.Controls.WindowBase.OnRootVisualSizeChanged()
at Telerik.Windows.Controls.WindowBase.Telerik.Windows.Controls.InternalWindow.IWindowDragAware.RootVisualSizeChanged()
at Telerik.Windows.Controls.InternalWindow.PopupWindowHost.Initialize()
at Telerik.Windows.Controls.InternalWindow.PopupWindowHost.OnPresenterLoadedForFirstTime(Object sender, RoutedEventArgs e)
at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)} System.Exception {System.NullReferenceException}

before i add on dock panel windows:

RadSplitContainer rsc = new RadSplitContainer();
rsc.InitialPosition = DockState.FloatingDockable;
RadPaneGroup rpg = new RadPaneGroup();
rsc.Items.Add(rpg);
RadPane rp = new RadPane();
rpg.Items.Add(rp);
rp.ContextMenuTemplate = null;
rp.Title = title;
rp.Header = title;
rp.Content = content;
RadDocking.SetSerializationTag(rp, header);
RadDocking.SetFloatingSize(rsc, new Size { Width = 400, Height = 400 });
dockPanel.Items.Add(rsc);

and if i load dock layout from XML

using (Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(profile)))
{
    stream.Seek(0, SeekOrigin.Begin);
    dockPanel.LoadLayout(stream);
}

on exit function i have error

[alexhome]

anybody home ????????????????????

[Miroslav Nedyalkov]

Hello Alexhome,

Although we review all forum threads the answer is not guaranteed. That's why if you need faster response you should post support tickets.
Now straight to the problem you have - if you are calling the LoadLayout method in the constructor of the MainPage this could be the problem. In order to make this work you might either postpone this action a little (using a Dispatcher.BeginInvoke) or to move it in the Loaded event handler. We will target this problem, but currently I cannot give you a concrete time frame.

Hope this helps.

Regards,
Miroslav Nedyalkov
the Telerik team

[Matt]

I'm seeing something somewhat similar with a null ref with a stack trace of:

at Telerik.Windows.Controls.InternalWindow.PopupWindowHost.Initialize()
at Telerik.Windows.Controls.InternalWindow.PopupWindowHost.OnPresenterLoadedForFirstTime(Object sender, RoutedEventArgs e)
at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

What's the status of this issue?

[Miroslav Nedyalkov]

Hi Matt,

We are aware of this problem and we will target it for the 2011 Q3 release. Here is the PITS item for the issue.

All the best,
Miroslav Nedyalkov
the Telerik team

[alexhome]

I download release 15 feb 2012, but the problem persists, you are promised !!!!!

i cant upgrade my project on new version radcontrol during the year !!!!!

if i execute next code by DispetcherTimer after 2 seconds, than all work fine

using (Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(profile))) 

{ 

   stream.Seek(0, SeekOrigin.Begin); 

   dockPanel.LoadLayout(stream); 

}

and new bug in new release, when I create a new dialog box (radcontrol modal window), then it is in the background, and dockable window in the foreground

[Miroslav Nedyalkov]

Hello Alex,

I know we promised, but the issue was postponed due to the available work-around which you found. About the other problem I would suggest you to use the dispatcher technique for both loading the layout and opening the dialog window.

Hope this helps.

Kind regards,
Miroslav Nedyalkov
the Telerik team