I'm trying to create a container that has a label and an arrow that you can click on to show the contents of the container (by default the contents are hidden). However, I would like to add the pretty Resize effect to make it appear but if there is no height defined the container should expand as necessary to display the contents. Is there any way to go from 0 height to whatever the auto-height is?
I could probably figure out a way to determine the height in pixels it wants to end up at, but even if I figure that out if I add content into it after I have done that it will no longer expand to fit will it?

