You’re right. OnCheckStateChanged does require a checkbox as target. I was confused with another event’s similar name.
Now I want to know which element called the event, as the graph shown, tries to print the name of the element containing the checkbox. But I always get the last element’s name. Is there a way to get a reference to the widget that’s calling OnCheckStateChanged? Ultimately I just wanna keep an array of checked and unchecked elements.