Apache flex 是否使用enter键查找上一个单词边界？

这段代码工作得很好，它得到了最后一个字，但当我使用enter键时 它的行为是错误的，并停止获得最后的话语权。当我注释findPreviousWordBoundary行时，它会得到所有文本：

<fx:Script>
    <![CDATA[
        import flashx.textLayout.elements.ParagraphElement;
        protected function togglebutton1_clickHandler(event:MouseEvent):void {
            var urlLoader:URLLoader = new URLLoader();
            var suggestions:Array = new Array();
            var suggested:Array = new Array();
            var textfields:Array = new Array();
            var format:TextFormat = new TextFormat();
            var currentSelection:int = -1;
            mytextflow.addEventListener(KeyboardEvent.KEY_UP, suggest);

            function suggest(event:KeyboardEvent):void {
                suggested = [];
                var activePos:int = mytextflow.selectionActivePosition 
                var curParagraph:ParagraphElement = 
                    mytextflow.textFlow.findLeaf(activePos).getParagraph(); 
                var wordBoundary:int = curParagraph.
                    findPreviousWordBoundary(activePos);
                //var lastword:String = curParagraph.getText(wordBoundary,activePos);
            }               
        }
    ]]>
</fx:Script>

<s:ToggleButton  x="21" y="10" 
    click="togglebutton1_clickHandler(event)"/>
<s:RichEditableText 
    id="mytextflow" 
    x="111" 
    y="43" 
    width="363" 
    height="285" 
    backgroundColor="#C39191"/>             
</s:Application>

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我不知道你想做什么。你能不能不要用翻译，找一个会说英语的人帮你把你的问题转换成一个合理的句子？