Input that indicates when the event is fired. This notification is only provided after the contents of the select set have changed so the value of this argument will always be kAfter.
Output that specifies how Autodesk Inventor is to handle the event. This argument is ignored for this event.
Remarks
This notification is sent when items are added or removed from the select set and when the select set is cleared. The current contents of the select set can be obtained through the document's SelectSet object. Note. You can get what appears to be double notifications of this event when an object is already selected and the end-user selects another object. In this case the first notification is because the current object(s) in the select set are being removed and the second notification is for the new entity being added.