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Hide the row on grid

Can I hide the row on grid but still have its value (all cells) when I am serializing the data from that grid using Grid.serialize()?

You can use
   grid.setRowHidden(id,true);
to hide row in grid ( method has known limitation, it may be problematic in case of srnd mode )

Technically instead of hidden row you can use global level userdata
http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Storing_additional_data.html#grid_art_userdata