Scrolling AND wiping with Blitmask

[emsee]

Hi,

 

I'm trying to add a wipe transition to an image that is being panned with Blitmask, but as the height of the blitmask changes, the scrollY is also changed. Is there a way to do this, or should I come up with a different way to do the wipe?

 

Here's my code:

blit = new BlitMask(image, 0, 0, 1920, 1080, false, true);
blit.y = 1080;
blit.height = 0;
blit.scrollY = 0;

var t:Array = new Array();
t.push( new TweenMax(blit, 1, { y:0, height:1080, delay:startTime } ) );
t.push( new TweenMax(blit, 10, { scrollY:1, delay:startTime } ) );
t.push( new TweenMax(blit, 1, { height:0, delay:startTime + 8 } ) );
score = new TimelineMax();
score.appendMultiple(t);