public void pop()
{
Screens.Remove(Screens.Last());
--ScreenCount;
if(ScreenCount>0)
mActiveScreen = Screens.ElementAt(ScreenCount-1);
}
public void push(Screen scr)
{
Screens.Add(scr);
++ScreenCount;
mActiveScreen = Screens.ElementAt(ScreenCount-1);
}
public ScreenStack()
{
Screens = new List<Screen>();
ScreenCount = 0;
mActiveScreen = null;
}