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: ChildEvent.m
    path of file: ./repos/BioSigKit/LayoutLib/layout/+uix
    
    the code of the file until where you have to start completion: classdef( Hidden, Sealed ) ChildEvent < event.EventData
    %uix.ChildEvent  Event data for child event
 
    
function obj = ChildEvent( child )
            %uix.ChildEvent  Event data for child event
            %
            %  e = uix.ChildEvent(c) creates event data including the child
            %  c.
            
            % Set properties
            obj.Child = child;
            
        end