public static void setTooltip(Component cmp, String t) {
    cmp.putClientProperty("tooltip", t);
}

public static void showTooltip(Component cmp, Form f) {
    final String t = (String)cmp.getClientProperty("tooltip");
    if(t == null) {
        f.setGlassPane(null);
    } else {
        int offset = Display.getInstance().convertToPixels(2) + 10;
        final Font fnt = cmp.getUIManager().getComponentStyle("Label").getFont();
        int width = fnt.stringWidth(t);
        int height = fnt.getHeight();

        int x = cmp.getAbsoluteX();
        if(x > f.getWidth() / 2) {
            x -= (width + offset);
        } else {
            x += cmp.getWidth() + offset;
        }
        int y = cmp.getAbsoluteY();
        if(y > f.getHeight() / 2) {
            y -= (height + offset);
        } else {
            y += cmp.getHeight() + offset;
        }

        final Rectangle rect = new Rectangle(x, y, width + 10, height + 10);
        final Rectangle shadow = new Rectangle(x + 5, y + 5, width + 10, height + 10);
        final Stroke s = new Stroke(3, Stroke.CAP_ROUND, Stroke.JOIN_ROUND, 1);
        f.setGlassPane(new Painter() {
            @Override
            public void paint(Graphics g, Rectangle r) {
                g.setColor(0);
                g.setAlpha(120);
                g.fillShape(shadow);
                g.setAlpha(255);
                g.setColor(0xeeeeee);
                g.fillShape(rect);
                g.setColor(0);
                g.drawShape(rect, s);
                g.setColor(0);
                g.setFont(fnt);
                g.drawString(t, rect.getX()  + 5, rect.getY() + 5);
            }
        });
    }
}

@Override
public void pointerHover(int[] x, int[] y) {
    Component c = getComponentAt(x[0], y[0]);
    if(c != null) {
        GuiBuilderUtils.showTooltip(c, this);
    }
}