Hello all,I have created a Custom Control Project with two controls inside :- NavBar : TabControl- NavBarItem : TabItemI have modified them and everything work fine when I use the DLL in an external application.But there is a problem I can't resolve, when I add a NavBar control from Blend 2.0 (in design mode), Blend automaticly create two <TabItem> inside my NavBar control xaml. But it's not <TabItem> controls that are used in my NavBar control, it's <NavBarItem>.If I manually replace TabItem by NavBarItem in the XAML code there is no problem, but I'd like it to be done automaticle when I add a NavBar control into a project.How can I tell in my custom control project that the default child for my NavBar control is NavBarItem and not TabItem ?Thank a lot, Dimitri.