Auto adjust and keep proportions

programming flash
1

Hi,

Does anybody knows how to auto adjust flash to the size of the window but preserving the size of the objects in the movie?.

These are two fantastic examples of that:

http://www.musicalarchitect.com/
http://www.mocafusion.com/

(try to resize the window and look how the objects adjust to the new size of the window)

I hope someone knows how to archive that.

Thanks