You use a repeating panel.
In the form used for the repeating panel you can put a link.
In the click event of the link you can change a selected form variable and the background color of the form or the role of a link or the text of a link or of a label.
At this point you have a repeating panel containing forms that respond to click events and show you whether they have been selected or not.
Then you can loop through the repeating panel’s items and ask each form if it has been selected.