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: BrainAtlasPF.m
    path of file: ./repos/BRAPH-2/braph2/src/atlas
    
    the code of the file until where you have to start completion: classdef BrainAtlasPF < BrainSurfacePF
	%BrainAtlasPF is a panel to manage the plot of a brain atlas.
	% It is a subclass of <a href="matlab:help BrainSurfacePF">BrainSurfacePF</a>.
	%
	% A Panel Figure for Brain Atlas (BrainAtlasPF) manages the plot of the brain 
	%  regions symbols, spheres, ids and labels. 
	% BrainAtlasPF utilizes the surface created from BrainSurfacePF to integrate 
	%  the regions to a brain surface.
	%
	% The list of BrainAtlasPF properties is:
	%  <strong>1</strong> <strong>ELCLASS</strong> 	ELCLASS (constant, string) is the class of the panel figure for brain atlas.
	%  <strong>2</strong> <strong>NAME</strong> 	NAME (constant, string) is the name of the panel figure for brain atlas.
	%  <strong>3</strong> <strong>DESCRIPTION</strong> 	DESCRIPTION (constant, string) is the description of the panel figure for brain atlas.
	%  <strong>4</strong> <strong>TEMPLATE</strong> 	TEMPLATE (parameter, item) is the template of the panel figure for brain atlas.
	%  <strong>5</strong> <strong>ID</strong> 	ID (data, string) is a few-letter code for the panel figure for brain atlas.
	%  <strong>6</strong> <strong>LABEL</strong> 	LABEL (metadata, string) is an extended label of the panel figure for brain at
    
function check_out = existsTag(tag)
			%EXISTSTAG checks whether tag exists in panel figure for brain atlas/error.
			%
			% CHECK = BrainAtlasPF.EXISTSTAG(TAG) checks whether a property with tag TAG exists.
			%
			% Alternative forms to call this method are:
			%  CHECK = PF.EXISTSTAG(TAG) checks whether TAG exists for PF.
			%  CHECK = Element.EXISTSTAG(PF, TAG) checks whether TAG exists for PF.
			%  CHECK = Element.EXISTSTAG(BrainAtlasPF, TAG) checks whether TAG exists for BrainAtlasPF.
			%
			% Element.EXISTSTAG(TAG) throws an error if the TAG does NOT exist.
			%  Error id: [BRAPH2:BrainAtlasPF:WrongInput]
			%
			% Alternative forms to call this method are:
			%  PF.EXISTSTAG(TAG) throws error if TAG does NOT exist for PF.
			%   Error id: [BRAPH2:BrainAtlasPF:WrongInput]
			%  Element.EXISTSTAG(PF, TAG) throws error if TAG does NOT exist for PF.
			%   Error id: [BRAPH2:BrainAtlasPF:WrongInput]
			%  Element.EXISTSTAG(BrainAtlasPF, TAG) throws error if TAG does NOT exist for BrainAtlasPF.
			%   Error id: [BRAPH2:BrainAtlasPF:WrongInput]
			%
			% Note that the Element.EXISTSTAG(PF) and Element.EXISTSTAG('BrainAtlasPF')
			%  are less computationally efficient.
			%
			% See also getProps, existsTag.
			
			check = any(strcmp(tag, { 'ELCLASS'  'NAME'  'DESCRIPTION'  'TEMPLATE'  'ID'  'LABEL'  'NOTES'  'TOSTRING'  'WAITBAR'  'H_WAITBAR'  'DRAW'  'DRAWN'  'PARENT'  'BKGCOLOR'  'H'  'SHOW'  'HIDE'  'DELETE'  'CLOSE'  'ST_POSITION'  'H_TOOLBAR'  'H_TOOLS'  'H_AXES'  'VIEW'  'ST_AXIS'  'LISTENER_ST_AXIS'  'SURFFILE'  'SURF'  'H_BRAIN'  'BRAIN'  'ST_SURFACE'  'ST_AMBIENT'  'BA'  'H_SPHS'  'SPHS'  'SPH_DICT'  'H_SYMS'  'SYMS'  'SYM_DICT'  'H_IDS'  'IDS'  'ID_DICT'  'H_LABS'  'LABS'  'LAB_DICT' })); %CET: Computational Efficiency Trick
			
			if nargout == 1
				check_out = check;
			elseif ~check
				error( ...
					['BRAPH2' ':BrainAtlasPF:' 'WrongInput'], ...
					['BRAPH2' ':BrainAtlasPF:' 'WrongInput' '\n' ...
					'The value ' tag ' is not a valid tag for BrainAtlasPF.'] ...
					)
			end