I have a window which has a few property grids in a flyout tab; I separated them into their own window, in a separate application. That window doesn't display my property grids either in design view or during runtime. It momentarily displayed them in design view, with a yellow triangle to indicate I should rebuild. When I did, the property grids disappeared again. I have no errors or warnings.
I don't see anything like a theme or other resource in the working application which I would need to copy over. I really hope this problem is as simple as it seems, but I can't find it. Help, please!