UpdateControl.
        [Preview API] Updates a control on the work item form.
        :param :class:`<Control> <azure.devops.v5_0.work_item_tracking_process.models.Control>` control: The updated control.
        :param str process_id: The ID of the process.
        :param str wit_ref_name: The reference name of the work item type.
        :param str group_id: The ID of the group.
        :param str control_id: The ID of the control.
        :rtype: :class:`<Control> <azure.devops.v5_0.work_item_tracking_process.models.Control>`

def update_control(self, control, process_id, wit_ref_name, group_id, control_id):
        """UpdateControl.
        [Preview API] Updates a control on the work item form.
        :param :class:`<Control> <azure.devops.v5_0.work_item_tracking_process.models.Control>` control: The updated control.
        :param str process_id: The ID of the process.
        :param str wit_ref_name: The reference name of the work item type.
        :param str group_id: The ID of the group.
        :param str control_id: The ID of the control.
        :rtype: :class:`<Control> <azure.devops.v5_0.work_item_tracking_process.models.Control>`
        """
        route_values = {}
        if process_id is not None:
            route_values['processId'] = self._serialize.url('process_id', process_id, 'str')
        if wit_ref_name is not None:
            route_values['witRefName'] = self._serialize.url('wit_ref_name', wit_ref_name, 'str')
        if group_id is not None:
            route_values['groupId'] = self._serialize.url('group_id', group_id, 'str')
        if control_id is not None:
            route_values['controlId'] = self._serialize.url('control_id', control_id, 'str')
        content = self._serialize.body(control, 'Control')
        response = self._send(http_method='PATCH',
                              location_id='1f59b363-a2d0-4b7e-9bc6-eb9f5f3f0e58',
                              version='5.0-preview.1',
                              route_values=route_values,
                              content=content)
        return self._deserialize('Control', response)