tableScrollPane = new JScrollPane(mainTable);
tableScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
// drag and drop
JPdfSelectionTableDropper dropper = new JPdfSelectionTableDropper(loader);
tableDropTarget = new DropTarget(tableScrollPane, dropper);
scrollPanelDropTarget = new DropTarget(mainTable, dropper);
buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.Y_AXIS));
buttonPanel.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));