I am using rad calendar thru which the use can select/unselect dates. And we will add some special days like holiday which can not be selected by the user. When I click on the column header 'M' if atleast one monday is a special day, then I am not able to unselect the complete column. Selection is possible even if special dates are availble. but only unselection is not possible. Is there any property to set or any solution to oversome this problem.