Bug 193231 RCP designer does not display Preview tab and View menu.
On RCP designer, Preview tab is missing and View Report menus. Please check the attached screen shot for detail.
viewer/org.eclipse.birt.report.viewer/src/org/eclipse/birt/report/viewer/utilities/WebappAccessor.java
* @param pluginId
	 *            plugin that defines the webapp
	 * @param path
	 *            webapp relative path to the plugin directory
	 * @exception CoreException
	 */
	public synchronized static void start( String webappName, String pluginId,
			IPath path ) throws CoreException
	{
		if ( applicationsStarted )
			return;
		
		IPath webappPath = getWebappPath( pluginId, path );
		
		
		IWebappServer server = AppServerWrapper.getInstance( ).getAppServer( );
		PluginClassLoaderWrapper loader = new PluginClassLoaderWrapper(
				pluginId );
		server.start( webappName, webappPath, loader );
		applicationsStarted = true;
	}
	/**
	 * Stops the specified web application.
	 * 
	 * @param webappName
	 *            web application name
	 * @exception CoreException
	 */
	public static void stop( String webappName ) throws CoreException
	{