If a button's sharedHilite property is set to true, the hilite property of that button is the same on all cards where the button appears. Highlighting the button on one card highlights it on all of them. If the button's sharedHilite is false, it can have a different hilite property on each card where it appears, and highlighting a button highlights it only on the current card.

Set the sharedHilite property to false for radio buttons and checkboxes (and for other buttons whose hilite is retained to display a setting or a state) if the state the button displays is different for each card.