Flex¿É¿ò選µÄTileList

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package
{
import flash.events.Event;
import flash.events.MouseEvent;
import flash.geom.Point;

import mx.controls.TileList;
import mx.controls.listClasses.TileBaseDirection;
import mx.core.UIComponent;
import mx.events.FlexEvent;
import mx.events.ScrollEvent;

[Style(name="nVerticalGap", type="String", inherit="no")]
[Style(name="nHorizontalGap", type="String", inherit="no")]

public class CustomTileList extends TileList
{
/**
* ´¹Ö±間¾à
*/
private var _verticalGap:Number = 0;
/**
* ˮƽ間¾à
*/
private var _horizontalGap:Number = 0;
/**
* µ×²¿±³¾°
*/
private var bg:UIComponent;
/**
* 選圖ui
*/
private var selectBox:UIComponent;
/**
* 開ʼ畫圖µÄÂä點
*/
private var startPoint:Point;
/**
* Æð點index×ø標
*/
private var startIndexPoint:Point;
/**
* 終點index×ø標
*/
private var endIndexPoint:Point;
/**
* ¿ò選時Êó標離開邊¿òµÄx軸¾à離
*/
private var offsetX:Number = 0;
/**
* ¿ò選時Êó標離開邊¿òµÄy軸¾à離
*/
private var offsetY:Number = 0;
/**
* ԭʼˮƽscrollbarλÖÃ
*/
private var oHScrollPosition:Number = 0;
/**
* ԭʼ´¹Ö±scrollbarλÖÃ
*/
private var oVScrollPosition:Number = 0;

public function CustomTileList()
{
addEventListener(FlexEvent.CREATION_COMPLETE, initBgHandler);
addEventListener(Event.ENTER_FRAME, autoScrollHandler);
}

/**
* ³õʼ»¯
* @param evt
*
*/
private function initBgHandler(evt:FlexEvent):void
{
initStyle();
bg = new UIComponent();
with(bg.graphics){
beginFill(0x0