Dynamic navigation?

[Jiang Ruihai]

Hello, all,
I want to print some thing to the navigation area of my webpage, how could I do?
Take newapp for example. 
In Default.vm, there is a navigation template "Menu.vm", see below,
        $navigation.setTemplate("/Menu.vm")
I want print a dynamic menu through Menu.vm, and I have written a class Menu.class to 
do it. 
But I don't know how to make Menu.class run when Default.vm is displayed.
Thank you.