Even though the drag'n drop example is very useful and the behaviour can be quite easily implemented, having the full set of DragEnter/DragOver/DragLeave/Drop events implemented would be very valuable. In this current state, one have to reimplement all of these behaviours with all the troubles caused by mouse capture everytime one need drag'n drop behaviour. It makes duplicated code everywhere this behaviour is needed. In my opinion, it is the kind of feature that is expected from an UI framework and not having to bother with part of this thing would be brilliant.