When Office2k7Blue theme is applied to xamTabControl then tab item header become highlighted as selectable only when mouse is over header "content". For example, if I set Header property of TabItemEx to string "header1" then I would be able to switch to this tab only if I put mouse over this string. That's OK when header caption is quite long, but if not (for example, just "2") then I should be very precise in pointing mouse. Is it possible to override this behavior so tab becomes selectable when mouse is anywhere in the header?
This seems like a bug in the template for that element. Since there are no visuals in that area when the mouse is not over the text, the element is not hit testable. I've submitted an issue for this and will see about getting a case created for you so you can be notified when the fix is available.
Thank you, Andrew!