* @param[in] control A control of this transition.
* @param[in] opacity opacity value the control Opacity property will be changed from/to.
* @param[in] timePeriod The duration of the animation.
* @param[in] control A control of this transition.
* @param[in] opacity opacity value the control Opacity property will be changed from/to.
* @param[in] timePeriod The duration of the animation.