public void onClick(ClickEvent event) {
PrintPreferencesCanvas canvas = new PrintPreferencesCanvas(mapWidget);
canvas.setMargin(WidgetLayout.marginSmall);
Window window = new KeepInScreenWindow();
window.setTitle(MESSAGES.printPrefsTitle());
window.addItem(canvas);
window.centerInPage();
window.setAutoSize(true);
window.show();
}