methods (Static, Access = protected)
  function flag = showSimulateUsingImpl
    flag = false;
  end
end

If you set the flag to true or omit the showSimulateUsingImpl method, which defaults to true, the dialog appears as follows when you add the object to Simulink^® with the MATLAB System block.

If you also specify a single value for getSimulateUsingImpl, the dialog appears as follows when you add the object to Simulink with the MATLAB System block.