Drag and drop NullReferenceException on the first drag and drop

[Eylon Ohevya]

Good evening,
I am implementing a drag and drop between two grids, which works fine and drags and drops great.
however, when I do the first drag and drop I get this error:
System.NullReferenceException occurred
  Message=Object reference not set to an instance of an object.
  Source=Telerik.Windows.Controls
  StackTrace:
       at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.StartDragging() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\DragDrop\RadDragAndDropManager.cs:line 1083
  InnerException: 

The error occurs once and when I continue running the code the next drag and drops works great.
I am doing the drag and drops from a dialog window invoked from within the software.
I am using Q2 SP1 release.
Please help,
Eylon

[Tsvyatko]

Hi Eylon Ohevya,

Could you please check more recent version (our latest internal build or Q3 SP1), since we had similar problem with the release you are using.

Regards,
Tsvyatko
the Telerik team