LibDirectoryNodeModel rootModel = new LibDirectoryNodeModel( ReportPlugin.getDefault( ).getResourcePreference( ) ); treeViewer.setInput( rootModel );
if ( treeViewer != null && !treeViewer.getTree( ).isDisposed( ) ) {    treeViewer.setInput( ResourceLocator.getRootEntries( LIBRARY_FILENAME_PATTERN ) ); treeViewer.expandToLevel( 2 ); }
	public void refreshRoot( )	{		LibDirectoryNodeModel rootModel = new LibDirectoryNodeModel(				ReportPlugin.getDefault( ).getResourcePreference( ) );		treeViewer.setInput( rootModel );	}