Sorry, wasn't sure how to begin describing this. I have a custom toolbar that I was calling from the Init method of a formset with 'ThisFormSet.toolbarname.Dock(0)'. I have "This.Dock(0)' in the Init code of the toolbar named in the above statement. The problem is, I changed the base custom class of the toolbar and now both the old and the new toolbars show up docked on the formset. This happens in the app and the exe.