Prevent fullcalendar from accepting every "droppable" object

Question

I'm using the jquery "dialog" feature to provide popup windows with fullcalendar. I use the "modal: true" setting to disable the parent page. However, fullcalendar tries to interact with the modal accepting it as a droppable object. As a result when you drag the modal the calendar days underneath highlight. When you let go the fullcalendar errors....

Answer 1

Got it,

drop-accept: 'div class of object'

under the calendar