We are adding child menu items at run time and the text is based on the User Language Preferences; so we can not use the FindItemByText method. Is there any client side method to get element by id so that we don't have to iterate through all the items for getting a particular item.
One suggestion would be adding value to the new item (which is chronological in manner ) when it is created, so that you can search the menuitem with the value using the findItemByValue() method. Checkout the following documentation for most important methods of RadMenu: RadMenu and RadContextMenu objects