JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.X_AXIS));
buttonPanel.add(imageButton);
buttonPanel.add(tilesetButton);
imageTree = new SpriteImageTree();
imageTree.setVisible(true);
final JScrollPane imageTreeScroller = new JScrollPane(imageTree);
JPanel rightPanel = new JPanel();
rightPanel.setLayout(new BoxLayout(rightPanel, BoxLayout.Y_AXIS));