Sets whether or not the first group should draw with the
        grouping style or not.
        
        :param     state | <bool>

def setUseGroupStyle(self, state):
        """
        Sets whether or not the first group should draw with the
        grouping style or not.
        
        :param     state | <bool>
        """
        self._useGroupStyle = state
        if state:
            self.setRootIsDecorated(False)