Datagrid Discrimination

[Bob Sneidar]

I am trying to determine if a group is a data grid. I tested earlier with a regular group of objects using this statement:

put (the dgProp ["allow editing"] of group theGroupName is not empty) into isDataGrid

It returned false for non-datagrid groups and true for data grid groups, since that dgprop must always return true or false. I thought I was being quite clever. 

NOW it is returning true for non-datagrid groups! Is there a simple way to test whether or not a gout is a data grid? I know this has been asked before, but I’m not sure the answers were comprehensive. I could check to see if it had a parent script, but then any group with a parent script that was not a data grid would pass that test. 

Is there a property that data grids possess that no other group possesses that I can use? 

Bob