How to create my own ShutDownControl-buttons?

Same as for themes, but located in "%gadgetDir%\Themes\Buttons\XXX.xaml".
Edit the content of the Grids to change button design.
Grid-name-button-correlation: sd = shutdown, re = reboot, sb = sleep (stand-by), lo = log off, su = switch user, hi = hibernate, lk = lock, ab = abort
The "forced" buttons use the same design as their non-forced pendants.