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Double Group By

I need to group two columns. Is this possible? I tried and the second groupBy overrides the first groupBy.

Unfortunately current version of dhtmlxGrid doesn’t support such functionality. If you need grouping effect you can try to use dhtlmxTreeGrid which has more extended functionality to work with parent-child relationships. Please see more information here http://dhtmlx.com/docs/products/dhtmlxTreeGrid/index.shtml
http://dhtmlx.com/docs/products/dhtmlxTreeGrid/samples/grid_operations/treegrid_aggregation.html