How to tell if a ListGridRecord is a group record

[rkumsher]

In the Smart GWT Showcase go to the Rollover Controls example and group by Continent.

http://www.smartclient.com/smartgwt/showcase/#grid_appearance_rollover_controls

Notice that the rollover canvas is displayed for the group records as well. Is there a way to prevent this?

I am looking for a method like rollOverRecord.getIsGroupRecord() but there doesn't seem to be one.

if(rollOverCanvas == null && !rollOverRecord.getIsGroupRecord())
{
     //Show buttons
}

Anyone have any advice on how to accomplish this?

Thanks