fixed.positionAbsolute(c);
((BlockBox)fixed).positionAbsolute(c);
    private void positionFixedLayer(RenderingContext c) {        Rectangle rect = c.getFixedRectangle();        rect.translate(-1, -1);        Box fixed = getMaster();        fixed.x = 0;        fixed.y = -rect.y;        fixed.setAbsX(0);        fixed.setAbsY(0);        fixed.setContainingBlock(new ViewportBox(rect));        fixed.positionAbsolute(c);    }