1. Add an new ui panel type which refer to an ui panle category onto UIHandler.cs
2. Set the uiscenedefault.txt
3. Set the uilayerpanel.txt
4. Create a binder script
5. Create a handler script which is partical class.
6. Make a prefab with the UIHolder component addon, then put it under a Resources folder.

Run the entry.unity and you will see the ui panels made just now.