code: function(o){
          if (Ext.isString(o)) {
              o = { text: o };
          }
          o = Ext.applyIf(o || {}, {
              text: this.busyText,
              iconCls: this.busyIconCls
          });
          return this.setStatus(o);
      }
docs: Convenience method for setting the status text and icon to special values that are pre-configured to indicate
  a "busy" state, usually for loading or processing activities.
  
  @param {Object/String} config (optional) A config object in the same format supported by {@link #setStatus}, or a
  string to use as the status text (in which case all other options for setStatus will be defaulted).  Use the
  `text` and/or `iconCls` properties on the config to override the default {@link #busyText}
  and {@link #busyIconCls} settings. If the config argument is not specified, {@link #busyText} and
  {@link #busyIconCls} will be used in conjunction with all of the default options for {@link #setStatus}.
  @return {Ext.ux.statusbar.StatusBar} this