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: gui.m
    path of file: ./repos/freefem_matlab_octave_plot/release-v2.0/demos
    
    the code of the file until where you have to start completion: % Demonstrates additiv plotting
%
% Author: Chloros2 <chloros2@gmx.de>
% Created: 2019-02-28
%
% Copyright (C) 2018 Chloros2 <chloros2@gmx.de>
%
% This program is free software: you can redistribut
    
function []=gui()
    addpath('ffmatlib');

    mesh_file = 'demo_Lshape_mesh.msh';
    fe_space_file = 'demo_Lshape_vh.txt';
    data_file = 'demo_Lshape_data.txt';
    handles.view = [-166,40];

%     mesh_file = 'capacitor_2d.msh';
%     fe_space_file = 'capacitor_vh_2d.txt';
%     data_file = 'capacitor_data_2d.txt';
%     handles.view = [-47,24];

    [data.p,data.b,data.t,data.nv,data.nbe,data.nt,data.labels]=ffreadmesh(mesh_file);
    [data.vh]=ffreaddata(fe_space_file);
    [data.u,data.Ex,data.Ey]=ffreaddata(data_file);
    handles.data = data;
    winWidth=700;
    winHeight=470;
    handles.f=figure('Name','ffpdeplot() demo','NumberTitle','off','MenuBar','none','visible', 'off', ...
                     'Position', [75 75 winWidth winHeight],'Resize','off');
    set(handles.f,'color',[0.95,0.95,0.95]);
    uicontrol('style','text','String', 'Chose Configuration:','position', [30 (60+30*12) 150 20], ...
              'HorizontalAlignment','left','BackgroundColor',[0.95,0.95,0.95],'FontWeight','bold','FontSize',9);
    handles.names = {'CenteredColor','Patch','Patch+Mesh','Contour','Quiver','Mesh','Boundary', ...
                     '3D-Patch','3D-Patch+Mesh','3D-Mesh','Grid'};
    for k = 1:numel(handles.names)
        str = handles.names{k};
        handles.cb(k) = uicontrol('Style','checkbox','Position',[30 (55+30*k) 130 20], ...
                                  'String',str,'Callback',@checkbox_callback);
    end