flex 快捷键弹出一个窗口，窗口上的input控件却会接受刚才的快捷键作为本输入

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flex 快捷键弹出一个窗口，窗口上的input控件却会接受刚才的快捷键作为本输入0

在父窗口捕捉到快捷键（比如按键A）然后使用PopUpManager.addPopUp弹出一个TitleWindow.并同时将TitleWindow上的一个TextArea设置焦点。
可是TitleWindow弹出来以后，上面的TextArea却接收了刚才的快捷键作为输入，显示一个A.

(补充:需要在IE浏览器，先打开一次TitleWindow，cancel，再打开的时候就会出现这个问题)

代码如下：
父窗体：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;
import mx.collections.ArrayCollection;
import mx.core.UIComponent;
import mx.events.CloseEvent;
import mx.managers.FocusManager;
import mx.managers.PopUpManager;
import mx.resources.ResourceManager;
import mx.controls.Alert;
private var dialog:Dialog=new Dialog();
private function OnKeyDown(event:KeyboardEvent):void
{
if(event.keyCode == 65)
{
Show();
}
}
private function Show():void
{
PopUpManager.addPopUp(dialog, this, false);
dialog.FindText.editable = false;
dialog.FindText.setFocus();
}
</mx:Script>
<mx:Form x="57" y="43" width="616" height="363" backgroundColor="#52EE9F">
<mx:TextArea id="textArea" keyDown="OnKeyDown(event);" width="584" height="327"/>
</mx:Form>

</mx:Application>

TitleWindow：

<?xml version="1.0" encoding="utf-8"?>
<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml"
        showCloseButton="true"
        layout="vertical"
        width="100%"
        height="100%"
        >
    <mx:Script>
        import mx.managers.IFocusManagerComponent;
        import mx.controls.Alert;
        import mx.core.IFlexDisplayObject;
        import mx.events.CloseEvent;
        import mx.managers.PopUpManager;
        import mx.managers.FocusManager;

        private function CancelButton_click(evt:MouseEvent):void
        {
        PopUpManager.removePopUp(this);
        }
    </mx:Script>
<mx:RadioButtonGroup id="Direction"/>
<mx:HBox width="100%">
<mx:VBox>
<mx:HBox horizontalAlign="left" width="100%" verticalAlign="middle">
<mx:ComboBox id="FindText" editable="true" width="200"></mx:ComboBox>
</mx:HBox>
</mx:VBox>
<mx:VBox horizontalAlign="right">
<mx:Button id="CancelButton" label="Cancel" click="CancelButton_click(event);" paddingLeft="1" paddingRight="1" width="100%"/>
</mx:VBox>
</mx:HBox>
</mx:TitleWindow>

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