Listbox Item Add problem

Hi,
i have a problem with my program. I want it to search the folder for new files and when it find something, listBox will add a new item (for example File name). File monitor is working for sure because command system("Pause") executes when i copy a file to my folder, but listBox is not updating. Why?

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#pragma once
#include "stdafx.h"
#include<iostream>


namespace Espadron {

	using namespace System;
	using namespace System::ComponentModel;
	using namespace System::Collections;
	using namespace System::Windows::Forms;
	using namespace System::Data;
	using namespace System::Drawing;
	using namespace System::IO;
	

	/// <summary>
	/// Summary for watcher
	/// </summary>

	
	
	
	public ref class watcher : public System::Windows::Forms::Form
	{
	public:
		watcher(void)
		{
			InitializeComponent();
			
			
		}

	

	protected:
		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		~watcher()
		{
			if (components)
			{
				delete components;
			}
		}
	private: System::Windows::Forms::ListBox^  listBox1;

	
	protected: 

		private:
		/// <summary>
		/// Required designer variable.
		/// </summary>
		System::ComponentModel::Container ^components;


		


#pragma region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>

		
		void InitializeComponent(void)
		{
			this->listBox1 = (gcnew System::Windows::Forms::ListBox());
			this->SuspendLayout();
			// 
			// listBox1
			// 
			this->listBox1->Font = (gcnew System::Drawing::Font(L"Microsoft Sans Serif", 9.75F, System::Drawing::FontStyle::Regular, System::Drawing::GraphicsUnit::Point, 
				static_cast<System::Byte>(238)));
			this->listBox1->FormattingEnabled = true;
			this->listBox1->ItemHeight = 16;
			this->listBox1->Items->AddRange(gcnew cli::array< System::Object^  >(2) {L"Gowno", L"Gowno2"});
			this->listBox1->Location = System::Drawing::Point(12, 14);
			this->listBox1->Name = L"listBox1";
			this->listBox1->Size = System::Drawing::Size(630, 196);
			this->listBox1->TabIndex = 0;
			this->listBox1->SelectedIndexChanged += gcnew System::EventHandler(this, &watcher::listBox1_SelectedIndexChanged);
			// 
			// watcher
			// 
			this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
			this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
			this->ClientSize = System::Drawing::Size(654, 230);
			this->Controls->Add(this->listBox1);
			this->Name = L"watcher";
			this->Text = L"watcher";
			this->ResumeLayout(false);

			
			////FileSystemWatcher
			FileSystemWatcher^ fsWatcher = gcnew FileSystemWatcher( );
			fsWatcher->Path = "c:\\Espadron\\";

			fsWatcher->NotifyFilter = static_cast<NotifyFilters> 
              (NotifyFilters::FileName | 
               NotifyFilters::Attributes | 
               NotifyFilters::LastAccess | 
               NotifyFilters::LastWrite | 
               NotifyFilters::Security | 
               NotifyFilters::Size );
			
			FSEventHandler^ handler = gcnew FSEventHandler(); 
			fsWatcher->Created += gcnew FileSystemEventHandler(handler, &FSEventHandler::OnChanged);
			 fsWatcher->Changed += gcnew FileSystemEventHandler(handler, &FSEventHandler::OnChanged);

			fsWatcher->EnableRaisingEvents = true;

		}

				

		

		
#pragma endregion
	private: System::Void listBox1_SelectedIndexChanged(System::Object^  sender, System::EventArgs^  e) {
				  
            
			
			 }

	


			 
			ref class FSEventHandler 
	         { 
			public:
				void OnChanged (Object^ source, FileSystemEventArgs^ e)
				{
					/////HERE IS MY PROBLEM I THINK
					watcher^ test = gcnew watcher(); 
					test -> listBox1 -> BeginUpdate();
					test -> listBox1 -> Items -> Add ("Strongigi");
					test -> listBox1 -> EndUpdate();
					


							 	
				}
				void OnRenamed(Object^ source, RenamedEventArgs^ e)
				{
			    Console::WriteLine("File: {0} renamed to {1}", 
                e->OldFullPath, e->FullPath);
			    }
			};	

			 
	};

}
 
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