GNOME Desktop Panel Question

Hello

I would like to use the “Custom Application Launcher” to creat a panel icon, that will call the “Shutdown GUI Dialog Box” which contains the options to Shut Down, Restart, Hibernate or Sleep.

I would also like to learn if each of those above four functions can be run individually from a “Custom Application Launcher” as I would like to place them inside a GNOME panel “Drawer”.

Thank you