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Using Group By option in dhtmlxGrid

I was using the dhtmlxGrid in our company project.
I tried using the group rows by column option as shown in the example.
Howeveri get a javascript error saying "this._gmask is null or not an object"

I think it might be because of the sequence of the js file included in the page.
Please help.

Thank You

To use groupBy() method you should include dhtmlxgrid_group.js file to your page. Please find more information here http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxgrid:api_method_dhtmlxgridobject_groupby

I did include that file.. but as I have included many files, i think the sequence has been affected.