Comment 3 for bug 1423877

I'm also using gnome-panel and I am seeing the same behavior.
This is pretty annoying as once you accidentally press shut down in the menu there is practically no easy way to undo this and whatever you press or even when xkill-ing the window your computer will shut down.
This can cause accidentally loosing unsaved work and similar.
To be more clear this happens when you click on the "Shut Down..." button in the appropriate menu of the "Indicator Applet Complete" applet.

Hope this helps.