@NotNull
  private static BufferedImage sampleImage() {
    int size = 16;
    BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
    Graphics ig = image.getGraphics();
    ig.setColor(new Color(0, true));
    ig.fillRect(0, 0, size, size);
    Color imageColor = UIUtil.getLabelForeground();
    ig.setColor(imageColor);
    ig.drawRect(size / 4, size / 4, size / 2 - 1, size / 2 - 1);
    ig.drawRect(1, 1, size - 3, size - 3);
    ig.dispose();
    return image;
  }
@NotNull
  private static BufferedImage sampleImage()