public void Hide(Guid id)
{
var n = NotificationMessages.Single(x => x.Id == id);
n.InvokeHideAnimation();
Task.Factory.StartNew(() =>
{
Thread.Sleep(200);
}).ContinueWith(t =>
{
NotificationMessages.Remove(n);
if (NotificationMessages.Any() == false)
{
InternalStopTimer();
IsOpen = false;
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}