private void EhThickness_ChoiceChanged(object sender, DependencyPropertyChangedEventArgs e)
{
if (_pen != null)
{
using (var suspendToken = _pen.SuspendGetToken())
{
_pen.Width = (float)_cbThickness.SelectedQuantityAsValueInPoints;
suspendToken.ResumeSilently();
};
OnPenChanged();
}
}
