code: function(nIndex) {
              var ePanelNode = this._panels[nIndex];
              if(!ePanelNode) {return false;} // invalid node
              if(YUD.hasClass(ePanelNode.firstChild, this.CLASSES.ACTIVE)) {return false;} // already open
              this._onClick(ePanelNode.firstChild);
              return true;
          }
docs: Open a panel
  @method openPanel
  @param {Integer} nIndex The position of the Panel.
  @return {Boolean} whether action resulted in opening a panel
  that was previously closed