selectionChanged message

[Peter Haworth]

I have a front script that intercepts the selectionChanged message to  
deal with some special handling of datagrids.  The dictionary says  
that selectionChanged is "Sent to a field or player when the selection  
is changed."  Obviously the datagrid message should be added to that  
description but it also seems form error I get in my script that other  
events cause a selectionChanged message to be created.  Does anyone  
have any experience of all the events that cause this message to be  
generated?
Thanks,

Pete Haworth