action selector for MD4 button

This is intentional. It was decided to remove action selector for the button controls on the MD4, since it is possible to achieve the same functionality in other ways, e.g. by having multiple buttons and only showing one at a time. That way you can also have unique button texts or symbols for each state.

But that mean to superpose all button which is not really easy.
And it need a digital variable for each buttons instead of just a state machine.

Changing the text of the button was easy to do with a blank button with a text on the top plugged to the same state machine.
Really shame that you remove this.

I agree that the action selector is great when you have many different states, with more than 3-4 states the workaround starts to get ugly. I've added your request for reintroducing the action selector to MD4 button controls. And, let's hope this topic gets voted up/commented here on the forum.