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grid expand group & collapse group attachEvent

Hi,

Is there a way to attach to an expand group or collapse group event?

Thanks,
Steve

There is an inner event "onGroupStateChanged", which occurs when some group closed|opened, but it doesn't provide any useful parameters

Can you post a snippet of code on how I would do this?

Basically when the user double clicks on the groups header, I want to be able to react to that.  So is there a way to add the inner class off of the grid to do this?

grid.attachEvent("onGroupStateChanged",function(){
   //will be called each time when group closed or opened
})

>>when the user double clicks on the groups header, I want to be able to react to that.
Can be done only by code customization. 
( dhtmlxgrid_group.js , line 225 t.ondblclick=function(e){ ... )