Listbox : CellClick vs Checkbox

Seems this should be easy… is there a way to tell when a user clicks on a listbox cell that is of type checkbox
if they changed the state of the checkbox, or just selected the row?

If they just selected the row, I just need to change LISTINDEX (easy enough)
but if they changed the state of the checkbox I need to do more

CellAction fires when a CheckBox is clicked in a ListBox.

Well I’ll be… Thanks… I missed that sentence in the LR