API EA.Diagram Method to get the Focus/reference selected object

[Guillaume]

Hi,
With a diagram script I can control and access the selected objects with diagram.SelectedObjects.
I'd like to get the focus/reference object e.g. if you select several classes, unselect and reselect one, it is shown with a hatched border. It doesn't seem to be possible to find this object in the script. Could a method be provided to do so ?