$("#FromDate").datepicker({maxDate: selectedDate});
or
$("#ToDate").datepicker({ beforeShow: function(dateText, inst) { ...
However when I use the following syntax it works like a charm:
$("#FromDate").datepicker("option", "maxDate", selectedDate);
or
$("#ToDate").datepicker("option", { beforeShow: function(dateText, inst) { ...
Anyone else having these problems?