Prevent fullcalendar from accepting every "droppable" object

I'm using the jquery "dialog" feature to开发者_如何学编程 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....

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Or set the option droppable = false.

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Got it:

drop-accept: 'div class of object'

under the calendar.