vbox inside hbox has 0 height
I'm having trouble getting a vbox panel inside of an hbox panel to show up. The vbox panel always has 0 height regardless of its children. I've reduced it to a simple example that illustrates the issue
The center and right panels are visible, but the left panel has 0 height. Giving it a fixed height works, but is not an option since the content is dynamic.
Any suggestions would be greatly appreciated.