Several changes and some restructuring.
Changed MEF resolution code to allow custom catalogs to be used for resolving dependencies.
Added Range class for Parallel programming
Added ListView sorting behavior
Added 2 overrides for IUIVisualizer.Show and ShowDialog to pass object owner for explicit window ownership management (to be used by view, not VM).
Added InDesigner property to ViewModel (just a copy of Designer.InDesignerMode)
Added new overrides for IMessageVisualizer to support icons, window owner, etc.
Allow ExportUIVisualizer to be applied more than once.
Remove IViewModelTrigger and rewrote ViewModelTrigger behavior to target event by name.
Added MultiTreeSelect behavior
Modified MTObservableCollection to support suspension of events
Added ChangeCursorAction to behaviors