We'd like to use the system chrome for our desktop app, but we'd also like to be able to draw on top of it. We would like to show a button that prompts them to purchase the trial version of our software for example, or notify them that there is an update available. I don't want to use custom Chrome because we want whatever is there by default. We simply want to draw on top of it. Is that an option? My Googling and experiments have not yielded much!