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
String servletName = (String) params.get( SERVLET_NAME_KEY );
		String format = (String) params.get( FORMAT_KEY );
		String resourceFolder = (String) params.get( RESOURCE_FOLDER_KEY );
		Boolean allowPage = (Boolean) params.get( ALLOW_PAGE_KEY );
		if ( PDF.equalsIgnoreCase( format ) )
		{
			servletName = "run"; 
		}
		else
		{
			if ( servletName == null || servletName.trim( ).length( ) <= 0 )
			{
				if ( allowPage == null )
					servletName = "frameset"; 
				else
				{
					servletName = allowPage.booleanValue( )
							? "frameset" : "run"; 
				}
			}
		}
		
		String maxrows = (String) params.get( MAX_ROWS_KEY );
		return createURL( servletName, report, format, true, resourceFolder,
				maxrows );
	}
	/**
	 * Create web viewer url to run the report.
	 * 
	 * @param servletName