Cant use my Playground profile tonight, so here is:
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Version 1.2 with hasChildren and setCurrent
The hasChildren can be tested as normal:
if (item.hasChildren())
Or you can do specific tests
if ( mi->hasChildren() & MenuItem::RIGHT) {/*yay! we have a child to the right!*/}
When using setCurrent, it will trigger an event if the item you set it to does not match the current.
menu.setCurrent( menu.getRoot() ); //will trigger a change if current!=root
I will keep the getRoot and getCurrent to returning references, because this is the methods most user will need. And, I do not want to introduce pointers (and the need to test for 0) to the beginners. Also, I like to guarantee that both the root, and the current returns a reference not a null, because of the reasons just stated. 
[edit]Thank you for useful feedback and suggestions![/edit]