ScalePlugin combines scaleX and scaleY into one "scale" property.
USAGE:
import com.greensock.TweenLite;
import com.greensock.plugins.TweenPlugin;
import com.greensock.plugins.ScalePlugin;
TweenPlugin.activate([ScalePlugin]); //activation is permanent in the SWF, so this line only needs to be run once.
TweenLite.to(mc, 1, {scale:2}); //tweens horizontal and vertical scale simultaneously
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