Exceptions when doing "Cut" with Parent + Child selected in WPF Designer

In the WPF Designer, anytime I try to do a "Cut" operation with a control and its parent container selected the following exception is thrown.

=> InvalidOperationException("Starting the operation is not supported")

This can be repeated by creating a new "Window" and dropping a "Button" into the root "Grid".   Doing a Ctrl+A followed by Ctrl+X will raise this exception.

I am using version "SharpDevelop_5.1.0.5071_Beta2_Source"