Fetching column data for clicked DataGrid cell

Question

I am using a DataGrid and the number of columns are based on the data thus dynamic; columns are added at runtime.  I am trying to use the same ItemRenderer for all columns.  The one piece I can not seem to get to work is knowing which datafield to use to populate each column.  I have tried getting the column.dataField from the current datacolumn to no avail; sample code listed below.  This is my first Flex project so my approach to the problem may not be the best; please alert me if this is the case.  I would appreciate any help you could lend.
                var dgListData:DataGridListData = listData as DataGridListData;
                var dataGrid:DataGrid = dgListData.owner as DataGrid;
                var column:DataGridColumn = dataGrid.columns[dgListData.columnIndex];
                var dataField = column.dataField;
                var lbl:Label = new Label();
                lbl.text = value[dataField];    // must add based on previously named source field; dataField
ce

Answer 1

Update:
     A few more details...
I am trying to do this inside of override public function set data(value:Object):void {}