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/WebViewer.java
* Start web application.
	 */
	private static void startWebApp( )
	{
		try
		{
			
			
			String debugMode = System.getProperty( REPORT_DEBUT_MODE );
			if ( debugMode == null )
			{
				
				ViewerClassPathHelper.setWorkspaceClassPath( );
			}
			WebappAccessor.start( ViewerPlugin.WEBAPP_CONTEXT, WebAppPlugin,
					Path.EMPTY );
		}
		catch ( CoreException e )
		{
			
		}
	}
	/**
	 * Stop web application
	 */
	private static void stopWebApp( )
	{
		try
		{
			WebappAccessor.stop( ViewerPlugin.WEBAPP_CONTEXT );