https://sourceforge.net/tracker/?func=detail&aid=2939943&group_id=152762&atid=785194

I wrote a custom constraint which checks a date: if date is less than a certain day it displays an alert. When using the buttons of datebox to navigate to a certain month/year it seems internally that datebox calls setValue, which has the effect of running my custom constraint multiple times even though user has not actually picked the date yet. If datebox contained an isOpen method, which if true indicates the calendar is open, then I could use that to fix my problem.

Alternative: have datebox recognize ON_OPEN event? Then I could implement an EventListener to solve this.