Where did you find the `ReserveTUs` and `ReserveTUsPressed` sprite names?
I am not aware of any such sprites' existence.
I made them up
I wanted to know the correct ones.
I found this on the 40K mod and it works:
- type: TFTDReserve
width: 59
height: 24
singleImage: true
files:
0: Resources/apoc/UI/reserve_TUs.png
But it only defines the not-pressed version.
The pressed state is simulated by changing the palette or something. See screen attached.
If this is my only option I guess I have to come up with a slightly different design for these icons.