I reworked the way this was done so we can easily re-enable this as I think it's clearer when it's inactive
(the difference between toggled and not toggled is pretty minor).
With this abstraction we could reset the tooltip etc. too.
This makes the default button work on sinks/sources, allows the drop
down to actually change the sink/source and removes the old menu code.
Some names and such are fixed in the glade file too.
Colin Guthrie