DataGrid Headerrenderer - Header Tooltip
package mypackage
{
  import mx.controls.Text;
  public class DGHeaderRenderer extends Text
  {
        public function DGHeaderRenderer()
        {
              height = 20;
        }
   
   
        override public function set data(value:Object):void {
              super.data = value;
        
               this.toolTip = "Click to sort by this column or reverse sort order.";
               super.invalidateDisplayList();
        }
  }
}
and use the above as
<mx:DataGridColumn id="mycol" headerText="Col" dataField="col1" headerRenderer="mypackage.DGHeaderRenderer"/>
               
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