一个用来在datagrid里显示用的checkbox范例，flex编程

package renderers
{
 import mx.controls.CheckBox;

 public class DGCheckBox extends CheckBox
 {  
  private var _data:Object;      

        override public function set data(value:Object):void
        {
            _data = value;
            if(_data)
            {
                var dgld:DataGridListData = DataGridListData(listData);
                selected = _data[dgld.dataField];               
            }   
        }
       
        override public function get data():Object
        {
            return _data;
       
        }       
      
       
        override protected function clickHandler(event:MouseEvent):void
        {
            super.clickHandler(event);
            var dgld:DataGridListData = DataGridListData(listData);
            _data[dgld.dataField] = selected;
            owner.dispatchEvent(new Event("updated"));
        }
 }
}