<extension point="org.eclipse.ui.menus">
  <menuContribution allPopups="false" 
                    locationURI="menu:org.eclipse.ui.main.menu">
     <menu
           id="fileMenu"
           label="File"
           mnemonic="F"
           tooltip="Main Menu">
        <command
              commandId="myPlugin.bundle.menuCommands.Exit"
              label="Exit"
              mnemonic="E"
              style="push"
              tooltip="Exits MyPlugin">
        </command>
     </menu>
  </menuContribution>
  </extension>

<extension point="org.eclipse.ui.commands">
  <command defaultHandler="myPlugin.bundle.commands.exit.ExitHandler"
        id="myPlugin.bundle.menuCommands.Exit"
        name="Exit">
  </command>
</extension>

protected void makeActions(IWorkbenchWindow window) {
    aboutAction = ActionFactory.ABOUT.create(window);
    register(aboutAction);
}

protected void fillMenuBar(IMenuManager menuBar) {
    MenuManager helpMenu = new MenuManager("&Help", "helpMenu");
    helpMenu.add(aboutAction);
    menuBar.add(helpMenu);
}

MenuManager fileMenu = new MenuManager("&File", "fileMenu");
    	helpMenu.add(aboutAction);
    	menuBar.add(fileMenu);
    	menuBar.add(helpMenu);