Sets whether or not this group box is collapsed.
        
        :param      state | <bool>

def setCollapsed( self, state ):
        """
        Sets whether or not this group box is collapsed.
        
        :param      state | <bool>
        """
        self.setCollapsible(True)
        if not self._inverted:
            self.setChecked(not state)
        else:
            self.setChecked(state)