[MonoDevelop] Closing dialog windows from my addin freezes MonoDevelop

[Scott Ellington]

All,

My addin is a welcome page for MonoDevelop.  It uses gecko#, and when a
certain link is clicked, I intercept the OpenUri to spawn a MonoDevelop
Gui command, such as:

Runtime.Gui.CommandService.CommandManager.DispatchCommand(FileCommands.NewProject);

This opens successfully, but when I try to either close it by clicking
the "New" or "Cancel" buttons, the window does not close and MonoDevelop
freezes.  This also occurs when I use FileCommands.OpenFile.  Strangely,
HelpCommands.TipOfTheDay, closes correctly.  

I'm not familiar with writing desktop apps, but I thought it might be a
threading issue.  So I tried wrapping the event handler as suggested in
the following:
http://deobald.glcn.com/wiki/index.php/Thread_management_in_MonoDevelop
without success.  I also checked to see if gecko# was spawning a thread
for the OpenUri event and it seems that my event handler is in the Gui
thread, so I can't see what the problem might be.

Finally I tried creating and destroying my own sample Gtk window without
any problem.  Anybody have any ideas, or other things to try next?

thanks in advance,
Scott Ellington