[saprahan]

в mxataGrid :

override protected function drawRowBackground(s:Sprite, rowIndex:int, y:Number, height:Number, color:uint, dataIndex:int):void {
    var renderer:IListItemRenderer = indexToItemRenderer(dataIndex);
    var data:Object = renderer.data;
    //color = function(data)
    super.drawRowBackground(s, rowIndex, y, height, color, dataIndex);
}