// What we really want to do is override [NSCell -nextState] to return
// NSOnState in lieu of NSMixedState but this works (aside from the
// very slightly noticeable drawing of - and then a check) -DE
// What we really want to do is override [NSCell -nextState] to return
// NSOnState in lieu of NSMixedState but this works (aside from the
// very slightly noticeable drawing of - and then a check) -DE