title: Format datagrid column color
body: <p>I have a advanced datagrid label function like this:</p>
  
  <pre><code>private function dgFormat(item:Object, column:AdvancedDataGridColumn):String{
  var v3:int = item.value1 - item.value2;     
  return "Total: " + v3;
  
  }
  </code></pre>
  
  <p>How can I change the text color of v3 dynamically? I want it to be red if it's less than zero &amp; black otherwise.</p>
  
  <p>thanks!</p>