code: function() {
      this.setColour(160);
      this.appendDummyInput()
          .appendField('option');
      this.setPreviousStatement(true);
      this.setNextStatement(true);
      this.setTooltip('Add a new option to the dropdown menu.');
      this.setHelpUrl('https://www.youtube.com/watch?v=s2_xaEvcVI0#t=386');
      this.contextMenu = false;
    }
docs: Add option.