Change EnumControl to EnumLabel, inherited from Label.
Change ValueControl to ValueLabel, inherited from Label.
Change ButtonControl to HMIButton, inherited from Button.
HMIButton implements IOPCControl so it can write to an OPCItem.
Fixed Enum values so they correspond to control program.
Disable buttons when Enable switch is not in REMOTE.
Gauges implement double-buffering so they don't blink.
Implement Converter tab.