Once I create a button I am only given the option to edit the 4 states (up, over, down, disable). There are no other options such as "Application Interactions, and "Custom Interactions. Can some help me find these options? What am I not doing?
Between Beta 1 and Beta 2, the interactions UI moved from the black floating HUD to its own panel below the layers panel. Select your button and then look in the "Interactions Panel" and click "Add Interaction".