How to change a button state to Visited?

Hello,

Since there is no built in "Visited" state for a button or a shape used as a button in Lectora, can somebody help me with a workaround to achieve the functionality? I tried using Show/Hide but could not get through it. Basically, I have couple oval shapes used as buttons. I want when a leaner clicks on them, they should turn to black with a check mark in the oval denoting that the content has been seen. I tried searching for a similar feature implementation on the community but I could not find steps.

Can anybody tell me some simple steps to implement this functionality?

Thanks in advance.