code: def clear_selections(self):
          
          self._selected = []
          for component in self._components.values():
              if isinstance(component, Optionable):
                  self._logger.info("<block: %s> clear selection an options for '%s'" % (self.name, component.name))
                  component.clear_options_values()
docs: Reset the current selections and **reset option** values to default
          for all components
          
          .. Warning:: This method also reset the components options values to
              the defaults values.