private static void DetachFrameEvents(NavButtonBehavior behavior, Frame frame)
{
if (behavior == null || frame == null)
{
return;
}
FrameEventRegistration eventReg;
if (!behavior._eventRegistrationInfo.TryGetValue(frame, out eventReg))
{
// events already detached
return;
}
behavior._eventRegistrationInfo.Remove(frame);
frame.UnregisterPropertyChangedCallback(Frame.CanGoBackProperty, eventReg.GoBackReg);
frame.UnregisterPropertyChangedCallback(Frame.CanGoForwardProperty, eventReg.GoForwardReg);
frame.Navigated -= behavior.OnNavigated;
frame.Loaded -= behavior.FrameOnLoaded;
}
