Checkbox groups -- like other groups, these by default now organize inline -- yet when I have a lot of options for a multi-select situation, the alignment is off and checkboxes can't be matched to values.
advmultiselect -- only commits 1 value to the database (would be a nice alternative to checkbox groups otherwise). The field type is text.
tabs -- only work on edit forms, not edit related records forms. Another potentially nice feature.
autocomplete -- appears to be broken. Upon going to an edit related record form with some autocomplete fields, I get an error:
Fatal error: Call to a member function addElement() on a non-object in /var/www/private/xataface-1.0-beta-01/Dataface/FormTool/autocomplete.php on line 7
documentation -- is there more than what you have on the web for new features?
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