Tweens a MovieClip backward to a particular frame number, wrapping it if/when it reaches the beginning
of the timeline. For example, if your MovieClip has 20 frames total and it is currently at frame 10
and you want tween to frame 15, a normal frame tween would go forward from 10 to 15, but a frameBackward
would go from 10 to 1 (the beginning) and wrap to the end and continue tweening from 20 to 15.
USAGE:
import com.greensock.TweenLite;
import com.greensock.plugins.*;
TweenPlugin.activate([FrameBackwardPlugin]); //activation is permanent in the SWF, so this line only needs to be run once.
TweenLite.to(mc, 1, {frameBackward:15});
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