/// <summary>
/// Controls call this to enter menu mode.
///</summary>
public void PushMenuMode(PresentationSource menuSite)
{
if (menuSite == null)
{
throw new ArgumentNullException("menuSite");
}
menuSite.VerifyAccess();
menuSite.PushMenuMode();
_menuModeCount += 1;
if (1 == _menuModeCount)
{
EventHandler enterMenuMode = EnterMenuMode;
if (null != enterMenuMode)
{
enterMenuMode(null, EventArgs.Empty);
}
}
}
