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/ViewerClassPathHelper.java
if ( prop == null || prop.trim( ).equals( "" ) ) 
			return new String[0];
		Vector list = new Vector( );
		StringTokenizer tokens = new StringTokenizer( prop, "," ); 
		while ( tokens.hasMoreTokens( ) )
		{
			String token = tokens.nextToken( ).trim( );
			if ( !token.equals( "" ) ) 
				list.addElement( token );
		}
		return list.isEmpty( ) ? new String[0] : (String[]) list
				.toArray( new String[list.size( )] );
	}
	public static boolean inDevelopmentMode( )
	{
		return inDevelopmentMode;
	}
	/*
	 * Load the given properties file
	 */
	private static Properties load( URL url )
	{
		Properties props = new Properties( );
		try
		{
			InputStream is = null;
			try
			{
				is = url.openStream( );
				props.load( is );