It works exactly the same except you have to hide the quick settings first. To do so, you just swipe them up. It's only annoying in that the quick settings show by default rather than a two finger swipe or a double swipe down like with stock Android (not familiar with TouchWiz). But I'm used to it. It's just a quick swipe up to get rid of the quick settings, then swiping down on your notification to expand it. And, like I said, first notification is always expanded by default. I'd imagine this is similar on the G4.