private void ToggleButton_Checked(object sender, RoutedEventArgs e)
{
PopupContentControl content = (sender as FrameworkElement).DataContext as PopupContentControl;
SetChecked(content);
Changed(nameof(CheckedContent));
}
public void SetChecked(PopupContentControl control)
{
foreach (var c in Popups)
{
c.IsChecked = c == control;
}
}
