Groupboxes should be able to take caption (or maybe label even) as an attribute in order to specify their title. eg. <groupbox> <caption label="Whatever"/> </groupbox> should be able to be specified as <groupbox caption="Whatever"/> or <groupbox label="Whatever"/>, the latter being more consitent with other things like buttons.
*** Bug 144151 has been marked as a duplicate of this bug. ***
This could fix bug 235916.