ShiftEventEnabled will make this easier.
Once you have that:
[/] 0 OnActivate | Client | (Type of print) | (Message 1)
[ ] 1 OnActivate | Client | (Type of print) | (Message 2)
[ ] 2 OnActivate | Client | (Type of print) | (Message 3)
[ ] 3 OnActivate | Client | (Type of print) | (Message 4)
.
.
.
[/] X OnActivate | Self | Shifteventenabled | [0 1 2 3...] [/]
"[/]" denotes a checked box.