[udaaff]

Узнаю своё дитя =) http://flasher.ru/forum/showthread.php?p=839737

tr.addEventListener(MouseEvent.CLICK, tr_clickHandler);
 
function tr_clickHandler(event:MouseEvent):void
{
	var beginIndex:int = txt.selectionBeginIndex;
	var endIndex:int = txt.selectionEndIndex;
 
	if (beginIndex == endIndex)
		return;
 
	var newString:String = "[" + txt.text.substring(beginIndex, endIndex) + "]";
	txt.replaceText(beginIndex, endIndex, newString);
}