private static void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
UseLevelSpinner control = (UseLevelSpinner)sender;
// When someone click on a part in the NumericUpDown and it's not focusable
// NumericUpDown needs to take the focus in order to process keyboard correctly
if (!control.IsKeyboardFocusWithin)
{
e.Handled = control.Focus() || e.Handled;
}
}
