Two comments:
1. I'd like to register my preference as not having the caption on by default. As it would match the previous behavior that many of us have come to expect as default.
2. When I cut and paste an existing AdvPanel without a caption enabled, the caption is enabled when the AdvPanel is pasted back to the form. Since this is a cut and paste operation, I would expect the component to retain it's existing properties like other components do.