      *  Item renderers are indexed by their DisplayObject name.
      *
      *  @see mx.controls.listClasses.ListBase#rowMap
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 9
+     *  @playerversion AIR 1.1
+     *  @productversion Flex 3
      */
     protected var columnMap:Object;
 

    /**
     *  Flag specifying that the set of visible columns and/or their sizes needs to
     *  be recomputed.
     */
    mx_internal var columnsInvalid:Boolean = true;


 *    showHeaders="true|false"
 *  /&gt;
 *  </pre>
 *  
 *  @langversion 3.0
 *  @playerversion Flash 9
 *  @playerversion AIR 1.1
 *  @productversion Flex 3
 */
public class DataGridBase extends ListBase implements IFontContextComponent
{
