Assuming FF_AllLights_PresetPercNormal is a Dimmer, try:
triggeringItem.sendCommand((FF_AllLights_PresetPercNormal.state as DecimalType).intValue)
I have not tried that actual construct, but this works:
var int BvoolState = (SqueezeBoxBoomsVolume.state as DecimalType).intValue
if (Cstate > 0) {
BvoolState += 10
} else {
BvoolState -= 10
}
SqueezeBoxBoomsVolume.sendCommand(BvoolState);
BTW see my example in handling triggeringItem in bottom half here. Nice feature.