first thanks for using AvalonDock.
The bug reported seems quite strange, I tested with latest version and it works as expected, it doesn't show anything. Why are you creating an empty dockable pane on the left?
The idea behind AvalonDock is that DockableContents are known at design time and they can be specified in XAML, DocumentContents otherwise are added at runtime as user open a new document. Could you please specify better what you are trying to do? Also why
are you deriving from DocumentPane and why are you loading a documentPane into a DockablePane?
Regarding AvalonDock life, I was very busy during last month for a project im working on, but Im continuing to add features and fix bugs that I publish via SVN (see DocumentSource property and more on SVN page). In a couple of weeks 1.2 release version will
Juergen: I had no time to merge your changes on AvalonDock, maybe you could please post them as SVN PATCH so I can check only the differences from my actual version. Sorry but I need carefully check every lines before publish it, SharpDevelop as well as
many other project are now based on AvalonDock.