ActionScript 3.0 :: Draw A Shape With A Registration Point Bottom Left?

Sep 14, 2009

I need to have 2 kinds of masks, one with a registration point in the top left so that when I tween its height it expands downwards, and one with a registration point in the bottom left so that when I tween its height it expands upwards?how do i do that, with code ofcourse?i have made something but i dont know if its the right way:(this expands downwards, but i dont know how to get it to expand upwards)

Code:
import gs.TweenLite;
var subMask:Shape = new Shape();

[code]......

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