I can change the background color of the tab panels (TabControl) via the Properties Window, but not when I try it via the (Collection) editor. I click on the BackColor Down Button (to the right) and I get an empty grey square where I would normally get my color options (Custom, Webb, System).
I ran the same test on a new project on a clean form and it works (change BackColor in Collection editor). I don't see why my TabControl would be any different on the software I am working on. Thanks in advance.