Please find attached a simple Exceed WPF Toolkit project which illustrates two issues I am experiencing:

For LayoutAnchorable 'la1' I have added a Closing event handler in which a user can select if the closing should be cancelled.  When the user selects to cancel the close, the LayoutAnchorable does not close, but its content does not remain visible.  What AvalonDock settings do I have to make so that the LayoutAnchorable and its content will remain visible when the close is cancelled by the user?

For LayoutAnchorable 'la2' I have set the CanClose property to false, but never-the-less, the user can close this LayoutAnchorable.  How can I prevent the close of a LayoutAnchorable?