private void HandleDownClick(object sender, RoutedEventArgs routedEventArgs)
{
if (AcceptUpDownOnNull && Number == null)
{
_number.ToMaximum();
}
else
{
_number.Decrease();
}
TakeNumber();
_textBox.Text = _number.ToString();
if (NumberSelectionBehavior == NumberBoxSelection.OnFocusAndUpDown || NumberSelectionBehavior == NumberBoxSelection.OnUpDown)
{
SelectAll();
}
}