new Vertex(slider.getWidthXY(TransformSpace.LOCAL)-3, -slider.getHeightXY(TransformSpace.LOCAL)/4f -2 + slider.getHeightXY(TransformSpace.LOCAL), 0),
new Vertex(2, slider.getHeightXY(TransformSpace.LOCAL)/2f, 0),
}, pa);
p.setFillColor(new MTColor(150,150,150, 150));
p.setStrokeColor(new MTColor(160,160,160, 190));
p.unregisterAllInputProcessors();
p.setPickable(false);
slider.getOuterShape().addChild(p);
slider.getKnob().sendToFront();
}