thumbnailList.setTransferHandler(new VisualListExportTransferHandler(null));
}
thumbnailList.setDragEnabled(true);
thumbnailList.setDropMode(DropMode.INSERT);
pagesWorker = new PagesWorker(thumbnailList);
thumbnailList.addKeyListener(new VisualPdfSelectionKeyAdapter(pagesWorker));
thumbnailList.addMouseListener(new PageOpenerMouseAdapter(thumbnailList));
if(showButtonPanel){
initButtonPanel(pagesWorker);
initKeyListener();