Selecting a button causes that button to change to the relief–effect selected state. When you remove your finger directly from the button, the selection becomes active.
If you slide your finger off the button and then off the screen, the function will not be selected and the button will revert to its previous state.
Buttons will be displayed in different colours depending on their current condition:
| Condition | Colour | |
| General Buttons | Permanently Unavailable | Dark Grey |
| Currently Unavailable | Light Grey | |
| Available/Normal | Blue | |
| Active | Amber | |
| Malfunction Button | Available | Blue |
| Armed | Yellow | |
| Active | Red |