code: function(type, args, obj) {
          var close = args[0],
              title = this.cfg.getProperty(DEF_CFG.TITLE.key);
      
          if (close) {
              if (!title) {
                  this.createTitleBar("&#160;");
              }
              this.createCloseButton();
          } else {
              this.removeCloseButton();
              if (!title) {
                  this.removeTitleBar();
              }
          }
      }
docs: Default handler for the "close" property
  @method configClose