Fix #613: NullReferenceException when I add `new DirectoryInfo(".")` to watches in debug.
Fixed bug; CanPrint was only checked for the first property using nested markup extension.
Fix #616: Accessing an object list in ConsolePad causes unhandled exception
Added update of child markup extensions when markup extension chain is updated.
Merge pull request #614 from jogibear9988/master

Bugfix Exception when Deleting Objects ...
Merge pull request #617 from gumme/WpfDesignerMarkupExtensionCanPrintFix

Fixed bug; CanPrint was only checked for the first property using nested...
Merge remote-tracking branch 'remotes/sd/master'