Gadget: StringSet
Bits: 0 - Inform client of changes using StringSet_ValueChanged.
1 - Writable field (default is display field).
3 - Inform client just before showing menu using StringSet_AboutToBeShown.
4 - No display or writable field.
5-6 - justification:
0 - left.
1 - right.
2 - centred.