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: ComparisonGroupBrainPF_xSPP_Layer.m
    path of file: ./repos/BRAPH-2/braph2/src/analysis
    
    the code of the file until where you have to start completion: classdef ComparisonGroupBrainPF_xSPP_Layer < PanelProp
	%ComparisonGroupBrainPF_xSPP_Layer plots the panel to select a layer.
	% It is a subclass of <a href="matlab:help PanelProp">PanelProp</a>.
	%
	% ComparisonGroupBrainPF_xSPP_Layer plots the panel to select a layer from a drop-down list.
	% It is supposed to be used with the property Layer of ComparisonGroupBrainPF_BS, ComparisonGroupBrainPF_NS, or ComparisonGroupBrainPF_GS.
	%
	% The list of ComparisonGroupBrainPF_xSPP_Layer properties is:
	%  <strong>1</strong> <strong>ELCLASS</strong> 	ELCLASS (constant, string) is the class of the %
    
function prop_list = getProps(category)
			%GETPROPS returns the property list of panel property layer.
			%
			% PROPS = ComparisonGroupBrainPF_xSPP_Layer.GETPROPS() returns the property list of panel property layer
			%  as a row vector.
			%
			% PROPS = ComparisonGroupBrainPF_xSPP_Layer.GETPROPS(CATEGORY) returns the property list 
			%  of category CATEGORY.
			%
			% Alternative forms to call this method are:
			%  PROPS = PR.GETPROPS([CATEGORY]) returns the property list of the panel property layer PR.
			%  PROPS = Element.GETPROPS(PR[, CATEGORY]) returns the property list of 'PR'.
			%  PROPS = Element.GETPROPS('ComparisonGroupBrainPF_xSPP_Layer'[, CATEGORY]) returns the property list of 'ComparisonGroupBrainPF_xSPP_Layer'.
			%
			% Note that the Element.GETPROPS(PR) and Element.GETPROPS('ComparisonGroupBrainPF_xSPP_Layer')
			%  are less computationally efficient.
			%
			% See also getPropNumber, Category.
			
			%CET: Computational Efficiency Trick
			
			if nargin == 0
				prop_list = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36];
				return
			end