There is a "click" button on the screen. The status of this button is sent to the user program. There is a second "toggle" button on the screen. The first button must put the second button in a non-pressed state if it was depressed. the user program (main.c) must make the decision. How to do it?
Take a look at the webinar that is posted at the top of this forum as a sticky - Here i go through how to turn on an LED from the UI and how to trigger an animation in the UI using a physical button. The same would apply here, except you're sending a message out of the UI and into the UI again to enable the second button.
