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
public static void display( String report, Browser browser, Map params )
	{
		startWebApp( );
		browser.setUrl( createURL( report, params )
				+ "&" + new Random( ).nextInt( ) ); 
	}
	/**
	 * Displays the specified url using eclipse SWT browser.
	 * 
	 * @param report
	 *            report report
	 * @param params
	 *            the parameter map to set
	 */
	public static void display( String report, Map params )
	{
		try
		{
			startWebApp( );
			BrowserAccessor.getPreviewBrowser( false )
					.displayURL(
							createURL( report, params )
									+ "&" + new Random( ).nextInt( ) ); 
		}
		catch ( Exception e )
		{
			
		}
	}
}