[Qt4 WinXP] Designer widget QTreeView problem

[gfunk]

Hi, I'm trying to create a custom designer widget that derives from QTreeView, for QtDesigner. However, I'm getting the attached error messages whenever I try to drag it onto, and access it within, the QtDesigner. (I didn't know VS2005 was written using .NET) Has anyone run across this before?

My widget class is very bare bones - all it really does is publicly inherit QTreeView. I can post it if needed.

(edit: apologies about the attachment - failed to realize they had failed to post previously because of the 800x600 size limitation)