code: def keyPressEvent( self, event ):
          
          if ( event.key() in (Qt.Key_Enter, Qt.Key_Return) ):
              self.emitSaveRequested()
          
          super(XQueryBuilderWidget, self).keyPressEvent(event)
docs: Emits the save requested signal for this builder for when the enter
          or return press is clicked.
          
          :param      event | <QKeyEvent>