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: MeasurePF_GB.m
    path of file: ./repos/BRAPH-2/braph2/src/gt
    
    the code of the file until where you have to start completion: classdef MeasurePF_GB < MeasurePF
	%MeasurePF_GB is the base element to plot the panel figure of a global bilayer measure.
	% It is a subclass of <a href="matlab:help MeasurePF">MeasurePF</a>.
	%
	% A Panel Figure for Global Bilayer Measure (MeasurePF_GB) manages the basi
    
function check_out = existsTag(tag)
			%EXISTSTAG checks whether tag exists in panel figure for global bilayer measure/error.
			%
			% CHECK = MeasurePF_GB.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(MeasurePF_GB, TAG) checks whether TAG exists for MeasurePF_GB.
			%
			% Element.EXISTSTAG(TAG) throws an error if the TAG does NOT exist.
			%  Error id: [BRAPH2:MeasurePF_GB:WrongInput]
			%
			% Alternative forms to call this method are:
			%  PF.EXISTSTAG(TAG) throws error if TAG does NOT exist for PF.
			%   Error id: [BRAPH2:MeasurePF_GB:WrongInput]
			%  Element.EXISTSTAG(PF, TAG) throws error if TAG does NOT exist for PF.
			%   Error id: [BRAPH2:MeasurePF_GB:WrongInput]
			%  Element.EXISTSTAG(MeasurePF_GB, TAG) throws error if TAG does NOT exist for MeasurePF_GB.
			%   Error id: [BRAPH2:MeasurePF_GB:WrongInput]
			%
			% Note that the Element.EXISTSTAG(PF) and Element.EXISTSTAG('MeasurePF_GB')
			%  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'  'ST_AXIS'  'LISTENER_ST_AXIS'  'M'  'SETUP'  'H_AREA'  'ST_AREA'  'LISTENER_ST_AREA'  'H_LINE'  'ST_LINE'  'LISTENER_ST_LINE'  'H_TITLE'  'ST_TITLE'  'H_XLABEL'  'ST_XLABEL'  'H_YLABEL'  'ST_YLABEL' })); %CET: Computational Efficiency Trick
			
			if nargout == 1
				check_out = check;
			elseif ~check
				error( ...
					['BRAPH2' ':MeasurePF_GB:' 'WrongInput'], ...
					['BRAPH2' ':MeasurePF_GB:' 'WrongInput' '\n' ...
					'The value ' tag ' is not a valid tag for MeasurePF_GB.'] ...
					)
			end