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: spm_XYZreg_Ex2.m
    path of file: ./repos/ExploreASL/External/SPMmodified
    
    the code of the file until where you have to start completion: function varargout=spm_XYZreg_Ex2(varargin)
% Example of Registry enabled XYZ GUI control / function
% FORMAT...
%_______________________________________________________________________
%
% Help goes here...
%
% Object must be indentifiable via a unique HandleGraphics object.
% In this code, this handle is called hMe.
%
% This HandleGraphics objects 'UserData' *must* be a structu
    
function has multiple places where you can change the XYZ,
% you could use an ``internal'' registry locally, with the external registry
% as one of it's entries! (I think?)
%
%_______________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Andrew Holmes
% $Id: spm_XYZreg_Ex2.m 5219 2013-01-29 17:07:07Z spm $


%=======================================================================
switch lower(varargin{1}), case 'create'
%=======================================================================
% hMe = spm_XYZreg_Ex2('Create',M,D,xyz)
if nargin<4, xyz=[0;0;0]; else, xyz=varargin{4}; end