syntax for execute in amgp file

[pseudotheist]

So, I'm trying to setup an onscreen keyboard toggle (as documented here).
When I can get the execute options entered through the gui, it works exactly as expected, but usually the configurator freezes before it can be implemented, and the one time it survived long enough to save, the configuration was not preserved. This may be a bug to be addressed, but I figure the quick fix is to configure the button in the .amgp xml. The only problem is I can't find any sample amgp files with execute buttons. Can anyone help me with that?

[pseudotheist]

Eventually managed to get a save committed; adding syntax here for posterity:
<button index="5"> <slots> <slot> <path>/usr/bin/dbus-send</path> <arguments>--type=method_call --dest=org.onboard.Onboard/org/onboard/Onboard/Keyboard org.onboard.Onboard.Keyboard.ToggleVisible</arguments> <mode>execute</mode> </slot> </slots> </button>