Error when dragging a view from a docking panel

Oct 29, 2014 at 11:39 AM
it happen to both the Example program, and the program I created.

The Caliburn.Micro.DevExpress library was re-compiled with my version of devexpress 13.2.
I also have reference to the Caliburn.Micro.FrameworkContentElement., and Caliburn.Micro

When I drag a view created by a DXDockingScreen inherited viewmodel, it return this error to me.
An unhandled exception of type 'System.InvalidOperationException' occurred in WindowsBase.dll

Additional information: Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead.