The method is used to refresh the menu when DOM operations add or replace a menu item. For example, if you add a new menu item through "menu.append," then you can use the refresh method to make sure that the new menu item appears in the menu.

var instance = new jQuery.wijmo.wijmenu();
var value; // Type: any
value = instance.refresh();

function refresh() : any;

//Adds a new item and refresh menu.
menu.append("<li><a href='#'>new item</a></li>").wijmenu("refresh");