Have you tried setting your Module tag to width="100%" and height="100%"?
Yes, that has no effect, it still comes in sized to the components in the Module, rather than sizing to the container.
Another shot in the dark.
How about setting your VBox definition to width and height 100%
Ah thank you very much - it was the combination of what you said in your first post along with your second post. I thought I had tried all the valid combinations of setting sizes on all the different components, but I guess I missed that one! Thanks so much - that was driving me crazy!
All children and grandchildren of the leftSide and rightSide may need to have %width/height, including the ModuleLoader, and definitely use percentWidth/Height=100 on the module.
Flex SDK Developer
Adobe Systems Inc.