title: Why can't I restrict a NumericStepper to include the negative sign?
body: <p>I want to restrict my NumericStepper so that you can't type invalid characters into it (like a comma).  I'm trying this, and it works:</p>
  
  <pre><code>&lt;s:initialize&gt;
      stepper.textDisplay.restrict = "0-9 \- .";
  &lt;/s:initialize&gt;
  
  &lt;s:NumericStepper id="stepper" /&gt;
  </code></pre>
  
  <p>Except the negative sign can't be typed anymore, even though I specify it.</p>
  
  <p>If I do it directly on a TextInput, it works:</p>
  
  <pre><code>&lt;s:TextInput restrict="0-9 \- ." minimum="-10" /&gt;
  </code></pre>
  
  <p>Why doesn't this work?</p>