func (v *Calendar) GetDayIsMarked(day uint) bool {
	c := C.gtk_calendar_get_day_is_marked(v.native(), C.guint(day))
	return gobool(c)
}
func (v *Calendar) GetDayIsMarked(day uint) bool {
	c := C.gtk_calendar_get_day_is_marked(v.native(), C.guint(day))
	return gobool(c)
}
// GetDayIsMarked is a wrapper around gtk_calendar_get_day_is_marked().