Issue #19: DropPosition
Issue #19: DropPosition

- Add DropPosition as public property of DropInfo.

git-svn-id: 0c1fea0d041f2968ed8210d06e1598c17ac6d68f@24 10a697b4-cb8d-11de-a774-41d3a1f294e1

Livit/Mailbird.Gong.WPF.DragDrop,emsaks/gong-wpf-dragdrop,JohnnyJoe/Johnny-s-repository,punker76/gong-wpf-dragdrop,ruisebastiao/gong-wpf-dragdrop,JohnnyJoe/Johnny-s-repository,Haukinger/gong-wpf-dragdrop,huoxudong125/gong-wpf-dragdrop