You can remove the caption by setting an empty text as Caption property value and setting ShowCloseButton to false. You can remove all buttons from the button bar by setting all CommonButtons properties to false. However the bars will still be visible and it's currently unfortunately not supported to completely hide these bars. However this is a good suggestion and we've added this the to the feature-request list for inclusion in a future version.
I have the latest version installed. It will save any value other than blank (''). Just delete the value for notes, save the form, reload it... "Notes" is back in the Notes property.