Activating it will be a simple addition to the "select action logic" of the selection box in the first window:
(Click here to cut and paste this code.)
And, of course, the button should be made inactive again when the selection is erased.
Note: this happens when the list of possible choices is rebuilt in the "gotFocus action logic":
(Click here to cut and paste this code.)
And, of course, in order to display the information, action logic will have to be entered for the "push action logic" of the button.
Go on to the next page in this sequence.