title: Unable to input numbers in TextField
body: <p>I'm trying to create a calculator to calculate the power energy and its cost.
  The following is my code and although it does not have error, i can't input numbers. I cant input alphabets because i restricted it but i cant input numbers too. </p>
  
  <pre><code>import flash.events.MouseEvent;
  
  ok_btn.addEventListener(MouseEvent.CLICK, multiplyClick);
  back_btn.addEventListener(MouseEvent.CLICK, backClick);
  
  var multiSym:Boolean  =  false; 
  var backSym:Boolean  =  false;
  
  usage.restrict = "0-9";
  power.restrict = "0-9";
  power.border = true;
  usage.border = true;
  
  var input1:String;
  var input2:String;
  var multiResult:Number;
  
  function multiplyClick(event:MouseEvent):void
  {
      multiSym = true;
      backSym = false;
  
      input1 = usage.text;
      input2 = power.text;
  
      if(multiSym == true){
          multiResult = parseInt(input1)* parseInt(input2);
          multiResult.toString();
          total_power.text  =  String(multiResult);
      } else {
          total_power.text = "Please Choose an option";
      }   
  }
  
  function backClick(event:MouseEvent):void
  {
      multiSym = false;
      backSym = true;
  }
  
  stop();
  </code></pre>
  
  <p>can someone help me?
  Thank you</p>