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: setdefaultbutton.m
    path of file: ./repos/bspm/thirdparty/spm12/matlabbatch/private
    
    the code of the file until where you have to start completion: function setdefaultbutton(figHandle, btnHandle)
% WARNING: This feature is not supported in MATLAB and the API and
% functionality may change in a future release.

%SETDEFAULTBUTTON Set default button for a figure.
%  SETDEFAULTBUTTON(BTNHANDLE) sets the button passed in to be the default button

    
function setdefaultbutton(figHandle, btnHandle)
% WARNING: This feature is not supported in MATLAB and the API and
% functionality may change in a future release.

%SETDEFAULTBUTTON Set default button for a figure.
%  SETDEFAULTBUTTON(BTNHANDLE) sets the button passed in to be the default button
%  (the button and callback used when the user hits "enter" or "return"
%  when in a dialog box.
%
%  This function is used by inputdlg.m, msgbox.m, questdlg.m and
%  uigetpref.m.
%
%  Example:
%
%  f = figure;
%  b1 = uicontrol('style', 'pushbutton', 'string', 'first', ...
%       'position', [100 100 50 20]);
%  b2 = uicontrol('style', 'pushbutton', 'string', 'second', ...
%       'position', [200 100 50 20]);
%  b3 = uicontrol('style', 'pushbutton', 'string', 'third', ...
%       'position', [300 100 50 20]);
%  setdefaultbutton(b2);
%

%  Copyright 2005-2007 The MathWorks, Inc.

%--------------------------------------- NOTE ------------------------------------------
% This file was copied into matlab/toolbox/local/private.
% These two files should be kept in sync - when editing please make sure
% that *both* files are modified.

% Nargin Check
if nargin<1, error('MATLAB:setdefaultbutton:InvalidNumberOfArguments','Too few arguments for setdefaultbutton'); end