code: function(type) {
          var me = this,
              oldType = me.type;
  
          me.type = type;
          if (me.rendered) {
              if (oldType) {
                  me.toolEl.removeCls(me.baseCls + '-' + oldType);
              }
              me.toolEl.addCls(me.baseCls + '-' + type);
          } else {
              me.renderData.type = type;
          }
          return me;
      }
docs: Sets the type of the tool. Allows the icon to be changed.
  @param {String} type The new type. See the {@link #type} config.
  @return {Ext.panel.Tool} this