[Size tweening help please]

I'm having problems getting a tween to work properly. You'll have to bear with my question, as I can't supply the full code to back it up:

 

I have a series of small movie clips (as children) to a main movie clip.

 

On mouseover of these child movie clips, I want the clip (which is a shape) to expand to double the size from its center point.

 

however, when I use, scalex, scaley or setSize, or even width height, the clip expands but also moves in an x and y position.

 

I can't seem to figure out how to stop this from happening, and to get the clip to expand from its top left x/y position.

 

i've tried this:

 

TweenMax.to(clip, 1.75, { width: 200, height: 200});

TweenMax.to(clip, 1.75, { setSize:{width: 200, height: 200}});

TweenMax.to(clip, 1.75, { scaleX:1.5, scaleY:1.5});

 

each one moves the object along its x and y as well as increasing its size..

 

Any ideas?