* has been provided with a {@link MessageSource}, it will be used to
* retrieve the splash screen's frame title under the key
* {@value #SPLASH_TITLE_KEY}.
*/
public final void splash() {
frame = shadowBorder ? new ShadowBorderFrame() : new JFrame();
if (isRootFrame())
JOptionPane.setRootFrame(frame);
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.setUndecorated(true);