'Return the value (from 0.0 to 1.0) of the specified tick.
**Arguments:**
tick            Can be either an integer corresponding to the index of the tick
or a Tick object. Ex: if you had a slider with 3 ticks and you
wanted the value of the middle tick, the index would be 1.'

def tickValue(self, tick):

    tick = self.getTick(tick)
    return self.ticks[tick]
