Java Layouty

Problem mam taki chcę użyć layoutu w widoku mojej aplikacji i gdy tworze klikając gui(windows builder) i w gridLayaoutcie dodaje button to działa. Jedank gdy przeklejam kod do listenera osblugującego naciśnieecie przycisku to nie ma rzadnych błędów jednak niedziała:
Kod niedziłający

package gui;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.layout.GridData;

public class MainWindow {
	protected Shell shell;
	private GridLayout gLayout = new GridLayout(1,false);
	  FormData fd_scrolledComposite;
	  Composite composite;

	/**
	 * Launch the application.
	 * @param args
	 */


	/**
	 * Open the window.
	 * @wbp.parser.entryPoint
	 */
	public void open() {
		Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	/**
	 * Create contents of the window.
	 */
	protected void createContents() {
		shell = new Shell();
		shell.setSize(703, 564);
		shell.setText("SWT Application");
		shell.setLayout(new FormLayout());
	
		
		Menu menu = new Menu(shell, SWT.BAR);
		shell.setMenuBar(menu);
		
		MenuItem mntmNewSubmenu = new MenuItem(menu, SWT.CASCADE);
		mntmNewSubmenu.setText("French");
		
		Menu menu_1 = new Menu(mntmNewSubmenu);
		mntmNewSubmenu.setMenu(menu_1);
		
		MenuItem mntmOptions = new MenuItem(menu_1, SWT.NONE);
		mntmOptions.setText("Options");
		
		MenuItem mntmDodajWyraz = new MenuItem(menu_1, SWT.NONE);
		mntmDodajWyraz.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				System.out.println("dodawanie");
			//	InputWindow inWin = new InputWindow(composite, SWT.NONE, "asd");
				new Label(composite, SWT.NONE);
				
				Button btnNewButton = new Button(composite, SWT.NONE);
				btnNewButton.setText("New Button");
			}
		});
		
		mntmDodajWyraz.setText("Dodaj wyraz");
		
		MenuItem mntmExit = new MenuItem(menu_1, SWT.NONE);
		mntmExit.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				System.exit(0);
			}
		});
		mntmExit.setText("Exit");
		
		 composite = new Composite(shell, SWT.NONE);
		composite.setLayout(new GridLayout(1, false));
		FormData fd_composite = new FormData();
		fd_composite.bottom = new FormAttachment(0, 378);
		fd_composite.right = new FormAttachment(0, 560);
		fd_composite.top = new FormAttachment(0, 2);
		fd_composite.left = new FormAttachment(0, 30);
		composite.setLayoutData(fd_composite);
	

//		 inputWindow1.setBounds(5, 5, 200, 27);
	}
}
 

atutaj ten sam kod tylko, że dodanie nowego buttona jest w create content

 package gui;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.layout.GridData;

public class MainWindow {
	protected Shell shell;
	private GridLayout gLayout = new GridLayout(1,false);
	  FormData fd_scrolledComposite;
	  Composite composite;

	/**
	 * Launch the application.
	 * @param args
	 */


	/**
	 * Open the window.
	 * @wbp.parser.entryPoint
	 */
	public void open() {
		Display display = Display.getDefault();
		createContents();
		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

	/**
	 * Create contents of the window.
	 */
	protected void createContents() {
		shell = new Shell();
		shell.setSize(703, 564);
		shell.setText("SWT Application");
		shell.setLayout(new FormLayout());
	
		
		Menu menu = new Menu(shell, SWT.BAR);
		shell.setMenuBar(menu);
		
		MenuItem mntmNewSubmenu = new MenuItem(menu, SWT.CASCADE);
		mntmNewSubmenu.setText("French");
		
		Menu menu_1 = new Menu(mntmNewSubmenu);
		mntmNewSubmenu.setMenu(menu_1);
		
		MenuItem mntmOptions = new MenuItem(menu_1, SWT.NONE);
		mntmOptions.setText("Options");
		
		MenuItem mntmDodajWyraz = new MenuItem(menu_1, SWT.NONE);
		mntmDodajWyraz.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				System.out.println("dodawanie");
			//	InputWindow inWin = new InputWindow(composite, SWT.NONE, "asd");
			
			}
		});
		
		mntmDodajWyraz.setText("Dodaj wyraz");
		
		MenuItem mntmExit = new MenuItem(menu_1, SWT.NONE);
		mntmExit.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
				System.exit(0);
			}
		});
		mntmExit.setText("Exit");
		
		 composite = new Composite(shell, SWT.NONE);
		composite.setLayout(new GridLayout(1, false));
		FormData fd_composite = new FormData();
		fd_composite.bottom = new FormAttachment(0, 378);
		fd_composite.right = new FormAttachment(0, 560);
		fd_composite.top = new FormAttachment(0, 2);
		fd_composite.left = new FormAttachment(0, 30);
		composite.setLayoutData(fd_composite);
		new Label(composite, SWT.NONE);
		
		Button btnNewButton = new Button(composite, SWT.NONE);
		btnNewButton.setText("New Button");
	

//		 inputWindow1.setBounds(5, 5, 200, 27);
	}
}

dlaczego to tak się zachowuje i jak zrobić aby działało to po naciśnieciu przycisku w menu