[flexcoders] Placement of Image within Image Control

[droponrcll]

I have an Image control that is supposed to be centered in a VBox.  The 
problem is that the image file itself may be of varying dimensions and 
aspect ratios.  When the image is smaller than the image control it is 
in, it is always at the top left of the image control container, 
causing it to look off center.  Are there any properties on the image 
control itself that say where to position the image within its 
container?

Thanks.