Manually adding drag and drop

Hi guys , obviously Im a newbie to flex...what I am doing is
putting together a multipl file uploader so far so good but I now
need to add drag and drop functionality and just stuck!
1. so I am listening for drag enter and once a file or
file(s) have been dragged over my target(datagrid) I will like to
check the file type to ensure its of *.pdf else show and alert.
2. I need to listen for drag drop or mouseUp and update my
datagrid accordingly even extracting the file details from at this
stage is baffling...pls find my code attached :(

> Does that mean then there is some runtime introspection happening to see if the object's class is castable?
The runtime understands what types are compatible with what other types. As a similar example that doesn't involve casting, you can assign a Button instance to a variable of type DisplayObject, but you can't assign it to a varible of type int. I believe it throws a TypeError when there is a type compatibility. But I don't think introspection is the right term for what is going on; I'd call it strict runtime type awareness.
Gordon Smith
Adobe Flex SDK Team

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