private static void menu_OnMenuItemClicked(Menu menu, MenuItem menuItem, DateTime time)
{
int duration = 0;
if (Parse.TryParseInt(menuItem.CommandArg, out duration))
{
menu.OnMenuItemClicked -= menu_OnMenuItemClicked;
menu.AutoRenderOnButtonPress = false;
TimeSpan ts = new TimeSpan(0, duration, 0);
countdown = new CountdownTimer(ts);
countdown.OnCountdownTimerElapsed += countdown_OnCountdownTimerElapsed;
countdown.Start();
cdt.Change(0, 1000);
ShowCountDown(null);
}
}