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
{
	private static final String WORKSPACE_CLASSPATH_KEY = "workspace.projectclasspath"; 
	static protected boolean inDevelopmentMode = false;
	static protected String[] devDefaultClasspath;
	static protected Properties devProperties = null;
	static
	{
		
		
		String osgiDev = System.getProperty( "osgi.dev" ); 
		if ( osgiDev != null )
		{
			try
			{
				inDevelopmentMode = true;
				URL location = new URL( osgiDev );
				devProperties = load( location );
				if ( devProperties != null )
					devDefaultClasspath = getArrayFromList( devProperties
							.getProperty( "*" ) );