code: function(labelNode) {
  			labelNode.id = this._dropdownTriggerButtonLabel.id;
  			this._dropdownTriggerButton.replaceChild(labelNode, this._dropdownTriggerButtonLabel);
  			this._dropdownTriggerButtonLabel = labelNode;
  		}
docs: Replaces this dropdown's default trigger button label node with the one specified.
  
  @param {DOMNode} labelNode A dom node which will replace the dropdownTriggerButtonLabel