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Highlight Active Cell

How do I highlight an active cell in a dxhtmlgrid?

The active cell in grid has "cellselected" css style, you can redefine it directly 
.cellselected{
       background-color:red !important;
}
or update related rule in dhtmlxgrid.css

http://dhtmlx.com/docs/products/dhtmlxGrid/doc/articles/Creating_custom_skin.html#grid_cust_skin