icsharpcode/SharpDevelop — pull request #79 by gumme (2013-12-05 10:53:49+00:00)
Title: Fixed SD-1931 - Dragging Pointer from toolbox to WPF designer throws exception.

As you can see I fixed the issue in 4.x branch. I assume you'll merge it up to master, or should I make another pull request to master?