private void OnDeleteScaleUnit(object sender, RoutedEventArgs e)
{
var delScaleUnit = (sender as FrameworkElement).DataContext as ScaleUnit;
var mf = MachineFunctions.FirstOrDefault(_ => _.ScaleUnits.Contains(delScaleUnit));
if (mf != null)
{
mf.ScaleUnits.Remove(delScaleUnit);
foreach (var scaleUnit in mf.ScaleUnits)
{
scaleUnit.Index = mf.ScaleUnits.IndexOf(scaleUnit);
}
}
}