You set this up in MC...
Open MC's options, type gizmo into the search field at the bottom...
Click on the one result, "Customise views for JRemote, Gizmo & Webgizmo"
Once set, OK your way out, and restart everything. Now when you connect your device, you should see the new 'category' you created above on your device.
Shout out if you need more detail on this.
-marko