#4 Drag events invalid

[Ma Bingyao]

Although the DragMode value is dmAutomatic,
OnDragDrop, OnDragOver, OnEndDrag, OnStartDrag
events are still invalid.

[Immo Wache]

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user_id=161824

This is not a bug but a missing feature. If you like to request this
feature for DWPL please add it to the Feature Requests at
https://sourceforge.net/tracker/?
atid=417489&group_id=36537&func=browse