boolean checked = isChecked(e);
float width = outputDevice.getDeviceLength(getWidth());
float height = outputDevice.getDeviceLength(getHeight());
FSColor color = box.getStyle().getColor();
FSColor darker = box.getEffBackgroundColor(c).darkenColor();
createAppearances(cb, field, onValue, width, height, true, color, darker);
createAppearances(cb, field, onValue, width, height, false, color, darker);
field.setWidget(outputDevice.createLocalTargetArea(c, box),
PdfAnnotation.HIGHLIGHT_INVERT);