libView = new LibView("Bibliothek", gui.getCore());
node = new DropTreeNode(libView);
top.add(node);
gui.setView(libView);
node = new DropTreeNode(new QueueView("Warteschlange", gui.getCore()),
true);
top.add(node);
queueTable = ((QueueView) node.getUserObject()).getTrackTable();
node = new DropTreeNode("Fehlerhafte Dateien");