videoCaptureElement not loading fixed,

when switching tabs, by using a Page

http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/85f39010-a9ef-45fd-879f-0784ffee9aec/
http://wpfmediakit.codeplex.com/discussions/431064

then fixed combobox and listbox triggering tabcontrol selection changed
http://stackoverflow.com/questions/7006875/wpf-unwanted-selection-change