[flexcoders] keeping aspect ratios of containers

[blc187]

is there an easy way to keep a container at a specific aspect ratio?

i have an hDividedBox but i want the vbox on the left side to always be twice 
as high as it is wide.  how can i keep a container at this aspect ratio while 
having the child on the right in the hDividedBox fill the rest of the space?