public JPanel buildMainPanel() {
JPanel pnl = new JPanel();
pnl.setLayout(new GridBagLayout());
pnlSlippyMapBBoxChooser = new SlippyMapBBoxChooser();
pnlSlippyMapBBoxChooser.addPropertyChangeListener(this);
pnl.add(pnlSlippyMapBBoxChooser, GBC.eol().fill());
Font labelFont = sizeCheck.getFont();
sizeCheck.setFont(labelFont.deriveFont(Font.PLAIN, labelFont.getSize()));