I'm working on a application that revolves around a Calendar View. The drag and drop feature is just superb however I've come up against an issue that I can't think of a way to solve so any help will be greatly appreciated.

The Calendar shows scheduled flights and as mentioned, it is great to be able to move them as we reschedule, but once the flight has taken place, the flight record has to be "locked" to the specific day that it took place (ie disable the drag and drop feature.) 

Is this somehow possible to achieve? (he asks hopefully!)

Best regards

Chris