While it is possible to programmatically add a menubar to a tab page with LoadMenuBar, it is not possible to do that in the UIR editor.
Sometimes I use a tab control to display different scenarios to the user hiding tabs so that he's not aware of the pages not shown: this permits to have a single panel with all elements properly placed and designed on the different pages and programmatically choose which page to display depending on operating conditions or other characteristics. In such a case the tab page behaves like a "normal" panel, but while you can have a standard child panel with its own menubar, you cannot add one to a tab page other than programmatically.
It would be a handy to be able to add a menubar to tab pages too in the editor.
