You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: paramtype_option.m
    path of file: ./repos/diplib/dipimage/private
    
    the code of the file until where you have to start completion: %PARAMTYPE_OPTION   Called by PARAMTYPE.

% (c)2017, Cris Luengo.
% Based on original DIPimage code: (c)1999-2014, Delft University of Technology.
%
% Licensed under the Apache License, Version 2.0 (the "License");
% you may not use this file except in compliance with the License.
% You may obtain a copy of the License at
%
%    http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS,
% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either expre
    
function varargout = paramtype_option(command,param,varargin)

switch command
   case 'control_create'
      fig = varargin{1};   % figure handle
      % Create a list of possible values and a list for display
      data = param.constraint;
      if isstruct(data)
         h = uicontrol(fig,'Style','text','String',' ','Visible','off');
         extent = get(h,'Extent');
         spw = extent(3);
         set(h,'String','  ');
         extent = get(h,'Extent');
         spw = extent(3) - spw; % This is the width added by a single space
         displist = {data.name};
         set(h,'String',displist);
         extent = get(h,'Extent');
         namew = extent(3) + spw; % This is the width of the widest name
         for ii=1:length(data)
            set(h,'String',data(ii).name);
            extent = get(h,'Extent');
            nspaces = round((namew - extent(3))/spw);
            displist{ii} = [data(ii).name,repmat(' ',1,nspaces),'- ',data(ii).description];
         end