flex3 comboBox 变身可输入可过滤搜索下拉选项，实例代码片段

	
	<fx:Script>
		<![CDATA[
 			...............
			private var enterpriseInfoRO:RemoteObject=ServiceLocator.getInstance().getRemoteObject("enterpriseInfo_RO_ID") as RemoteObject;
			private var reportRO:RemoteObject=ServiceLocator.getInstance().getRemoteObject("reportRO") as RemoteObject;


			[Bindable]
			private var enterprise_info:Array=[];
			[Bindable] 
			public var inputEStr:String;
			
			private var checkBox:CheckBox;
			[Event(name="onDocumentLoadedError",type="flash.events.ErrorEvent")]
			
			............

			//加载企业信息
			public function loadEnterpriseInfo():void
			{
				enterpriseInfoRO.getEnterprisesListByTID(cityInfo_CB_ID.selectedItem.value);
				enterpriseInfoRO.addEventListener(ResultEvent.RESULT,enterpriseInfo_Handle);
			}

			public function enterpriseInfo_Handle(e:ResultEvent):void
			{
				enterpriseInfoRO.removeEventListener(ResultEvent.RESULT,enterpriseInfo_Handle);
				if (e.result != null)
				{
					/**********返回列表*************/
					var tempList:ArrayCollection=e.result as ArrayCollection;
					var arr:Array=tempList.toArray();
					enterprise_info=[];
					for (var a in arr)
					{
						enterprise_info.push({label: arr[a][1],value: arr[a][0]});
					}
					enterpriseInfo_CB_ID.selectedIndex=0;
					//flag=true;
					loadReport();
				}
			}

			//加载报表信息
			public function loadReport():void
			{
				currentState='state1';
				inputEStr=enterpriseInfo_CB_ID.text;
				if (enterpriseInfo_CB_ID.selectedItem != null)
				{

					reportRO.getReportInfo(enterpriseInfo_CB_ID.selectedItem.value,time_ID.getTime_flag(),time_ID.getDate());
					reportRO.addEventListener(ResultEvent.RESULT,reportInfo_Handle);
				}
			}
			
			protected function search_keyUpHandler(event:KeyboardEvent):void
			{
				if(event.keyCode.toString()=='32'||event.keyCode.toString()=='13'||event.keyCode.toString()=='8'){
					inputEStr=enterpriseInfo_CB_ID.text;
					enterpriseInfoRO.getEnterprisesListByValue(cityInfo_CB_ID.selectedItem.value,StringUtil.trim(inputEStr));
					enterpriseInfoRO.addEventListener(ResultEvent.RESULT,_result_enterprise_bySearch); 
				}
			}
			
			private  function _result_enterprise_bySearch(e:ResultEvent):void{
				enterpriseInfoRO.removeEventListener(ResultEvent.RESULT,_result_enterprise_bySearch);
				if(e.result != null){
					/**********返回列表*************/
					var tempList: ArrayCollection = e.result as ArrayCollection;
					var arr: Array = tempList.toArray();
					var index:int=0;
					enterprise_info=[]; 
					for(var a in arr)
					{
						enterprise_info.push({label:arr[a][0],value:int(arr[a][1])});
						index++
					}

					enterpriseInfo_CB_ID.text=inputEStr;
					enterpriseInfo_CB_ID.open();
				}
				
			}
			public function reportInfo_Handle(e:ResultEvent):void
			{
				reportRO.removeEventListener(ResultEvent.RESULT,reportInfo_Handle);
				report_group_id.removeAllElements();
				if (e.result != null)
				{
					/**********返回列表*************/
					var tempList:ArrayCollection=e.result as ArrayCollection;
					var arr:Array=tempList.toArray();
					for (var a in arr)
					{
						var vGroup:VGroup=new VGroup();
						
						var image:Image=new Image();
						image.source=(String(arr[a][3]) == "0" ? "assets/png/report.png" : "assets/png/report2.png");
						image.name=String(arr[a][2]);
						image.useHandCursor="false";
						image.buttonMode="true";
						image.mouseChildren="false";
						image.addEventListener(MouseEvent.CLICK,reportDetail);
						
						vGroup.addElement(image);
						
						var hGroup:HGroup=new HGroup();
						
						var label:Label=new Label();
						label.text="表" + arr[a][1];
						
						var cb:CheckBox=new CheckBox();
						cb.label="审核";
						cb.selected=(String(arr[a][3]) == "0" ? false : true);
						cb.id=String(arr[a][0])+"##"+String(arr[a][2]);
						cb.addEventListener(Event.CHANGE,cb_change);
						
						hGroup.addElement(label);
						hGroup.addElement(cb);
						vGroup.addElement(hGroup);
						report_group_id.addElement(vGroup);
						
					}
					enterpriseInfo_CB_ID.text=inputEStr;
				}
			}

		



		]]>
	</fx:Script>



	<s:BorderContainer width="100%"
				..............		
				<mx:FormItem label="企业:"
							 indicatorGap="0">
					<mx:ComboBox id="enterpriseInfo_CB_ID"
								 dataProvider="{enterprise_info}"
								 selectedIndex="0"
								 editable="true"
								 minWidth="100"
								 change="loadReport()"
								 keyUp="search_keyUpHandler(event)"
								 width="200"/>
				</mx:FormItem>

				..............
	</s:BorderContainer>