// this is quite arbitrary (time of coding ;-)
BindingGroup group = new BindingGroup();
group.addBinding(Bindings.createAutoBinding(READ,
leadingDaysBox, BeanProperty.create("selected"),
monthView, BeanProperty.create("showingLeadingDays")));
group.addBinding(Bindings.createAutoBinding(READ,
trailingDaysBox, BeanProperty.create("selected"),
monthView, BeanProperty.create("showingTrailingDays")));
group.addBinding(Bindings.createAutoBinding(READ,
weekNumberBox, BeanProperty.create("selected"),