Event on Grouping feature

[Neethi]

Hi ,

Is there any event that gets fired when I group a grid by some column. I could see events that are fired when click on grouping header, grouping expand and collapse. But need an event that fires once we click on Group By this This Field.
I'm just trying to hide/show the expand/collapse button based on grouping on/off

Thanks in advance..

[Neethi]

Got it working by using groupchange event which is in Store..