protected override void OnDeactivated(EventArgs e)
{
base.OnDeactivated(e);
KeyboardManager.EnableSystemKeys();
WindowsManager.StartMonitoringActiveAppChangesIfNeeded();
}
protected override void OnActivated(EventArgs e)
{
base.OnActivated(e);
KeyboardManager.DisableSystemKeys(this.VisualTreeChildren <IHandleKeyboardHookControl>().ToList());
}