title: Sencha Touch input field keydown event not firing
body: <pre><code>{
      xtype: 'numberfield',
      name: 'weight',
      minValue: 10,
      maxValue: 1000,
      placeHolder: 'WEIGHT',
      cls: 'GoldWtLayout',
      id: 'GoldWtKgLayoutMum',
      enableKeyEvents: true,
      listeners: {
          keydown: function(){
              alert('keydown');
          }
      }
  }
  </code></pre>