protected override void OnTextInput(TextCompositionEventArgs e)
{
base.OnTextInput(e);
if (e.Handled)
{
return;
}
if (e.UserInitiated && e.Text == " " && this.IsMainMenu && (base.CurrentSelection == null || !base.CurrentSelection.IsSubmenuOpen))
{
base.IsMenuMode = false;
HwndSource hwndSource = PresentationSource.CriticalFromVisual(this) as HwndSource;
if (hwndSource != null)
{
hwndSource.ShowSystemMenu();
e.Handled = true;
}
}
}