Sort of OT: Lightdm's menus

Hi All, Please tolerate the somewhat off topic nature of this question. Lightdm comes with the Live spins of Xfce and I use the Live spins to install Linux and Xfce. On lightdm's login menu, in the upper right corner of the toolbar, there is a power button that allows you to shutdown, reboot, etc.. Is there a way to add an item to this menu? Many thanks, -T