when the notify message popup in the middle of the tray, the buttons (icons?) on the right corner is hidden. However, I've just found out that I can still click them to open related window even if they are not visible.

Since the message in the middle will not be hidden when the cursor is anywhere on the tray, I get trouble when I want to click sth under the tray. I will click on the hidden icons instead.

My particular problem is that when I receive a phone call from google talk, there is a popup message from empathy and I need to use the button from gmail to answer it, which is right in the bottom right corner of the screen, and I always click things that I don't want.

Is it possible to really hide those button?

Thanks.