Use the plugin JW Change > Note Entries > Grace Note Slash

If you don't have the plugin, you can download it at www.finaletips.nu

AFAIK, it is only possible if in Document Options -> Grace Notes, "Always Slash Grace Notes" is NOT checked.

By default, all the grace notes won't be slashed. Then to add the slash :

• In Speedy, use the G or ; key

• or use the plugin Notes... -> Slash flagged Grace Notes

• or use JW Change -> Note Entries -> Grace Note Slash -> Slashed (like Miker suggested).

Correct, Michel. If you don’t have it set that way, the plugin asks if you would like it turned off.