Missing: The validation is currently not working as expected, and I cannot get the backend
to give me meaningful data helping us "go back" to the field that wasn't valid. I really
don't want to put all the meaningful validation on the front-end; that's the road to -
perdition, the back-end must be usable by people less assiduous than we are.
Also: Need to make the button bar work better; maybe each panel can provide a custom button
bar if one is needed?
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