WebKit browser control's DragEnter, DragOver, DragDrop events not firing in C# winform Application

I am using WebKit browser control in my .net winform application. However, 开发者_JAVA技巧I noticed that its DragEnter, DragOver, DragDrop events are not firing. I am trying to drop a tree view node into it.

Please help.

Thanks, Omky