rollover.rectangle(5, 5, 90, 40);
rollover.fill();
PdfAppearance down = cb.createAppearance(100, 50);
down.setColorFill(Color.BLUE);
down.rectangle(5, 5, 90, 40);
down.fill();
pushbutton.setFieldName("PushMe");
pushbutton.setAppearance(PdfAnnotation.APPEARANCE_NORMAL, normal);
pushbutton.setAppearance(PdfAnnotation.APPEARANCE_ROLLOVER, rollover);
pushbutton.setAppearance(PdfAnnotation.APPEARANCE_DOWN, down);
pushbutton.setWidget(new LwgRectangle(100, 700, 200, 750), PdfAnnotation.HIGHLIGHT_PUSH);