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
*            servlet name to viewer report
	 * @param report
	 *            report file name
	 * @param format
	 *            report format
	 * @param resourceFolder
	 *            the resource folder
	 * @param maxrows
	 *            max rows limited
	 * @return valid web viewer url
	 */
	private static String createURL( String servletName, String report,
			String format, boolean inDesigner, String resourceFolder,
			String maxrows )
	{
		String encodedReportName = null;
		try
		{
			encodedReportName = URLEncoder.encode( report, "utf-8" ); 
		}
		catch ( UnsupportedEncodingException e )
		{
			
		}
		String locale = ViewerPlugin.getDefault( ).getPluginPreferences( )
				.getString( USER_LOCALE );
		String svgFlag = ViewerPlugin.getDefault( ).getPluginPreferences( )
				.getString( SVG_FLAG );
		boolean bSVGFlag = false;