Button Library
This screen appears when you touch "Button Library" on the Settings
screen.
The names of all the available buttons are listed.
Touch a button name to see or change the properties of the button.
The "Edit" button lets you add, delete or reorder buttons. If you delete a button, it will disappear from any screens that used it.
To add a button, enter Edit mode and a "+" button appears that lets you create a new button.
Some default buttons may be protected, and can't be deleted or edited.