I just noticed that ViewStack has an undocumented property: "resizeToContent"
"to force ViewStack containers to resize when you navigate to a different child container, set the resizeToContent property to true." This is mentioned on the Developing Flex Applications but it is not documented on the Flex ActionScript and MXML API Reference. And the best part is... it works :) I think this should be added to the Flex ActionScript and MXML API Reference? -- Mika
