collapseAllGroups after XML load

Suite and Optimus Suite 5
#1

Which event I should use to collapse all groups after data loaded from XML file? onGroup does not work.

grid.load('getData.php','xmlB'); grid.attachEvent("onGroup", function(){ this.collapseAllGroups(); });

#2

Please, try to use:

grid.load('getData.php','xmlB');      
   grid.collapseAllGroups();
});