Navbar items
You can use the Navbar items dialog to prepare the Navbar Items property at designtime. This dialog offers to you the ability to create Navbar items and their subitems too. Remember it's possible to change the Navbar Items property at runtime, but, using this IDE dialog you can set some default items and subitems, maybe the final ones, if you wanted.
There is a Navbar sample app included with the installation of DecSoft App Builder. Take a look to see the above dialog in action!