private void EditingElement_LosingFocus(UIElement sender, LosingFocusEventArgs args)
{
if (args.NewFocusedElement is Popup)
{
args.Cancel = true;
args.TryCancel();
args.TrySetNewFocusedElement(args.OldFocusedElement);
}
}
bool ILosingFocusEventArgsResolver.TrySetNewFocusedElement(LosingFocusEventArgs e, DependencyObject element) => e.TrySetNewFocusedElement(element);