code: function () {
          var me = this;
  
          var widthCorrection = 0;
          if (Ext.isGecko) { widthCorrection = -2; }
          if (Ext.isOpera) { widthCorrection = -2; }
          if (Ext.isIE) { widthCorrection = -2; }
  
          return widthCorrection;
      }
docs: -----------------------------------------------------------------