双击CAD对象，显示自定义对话框实现方法 - Double Click Event in AutoCAD

双击CAD对象，显示自定义对话框实现方法 - Double Click Event in AutoCAD

Must be used like this:

 Autodesk.AutoCAD.Interop.AcadDocument acaddoc = (Autodesk.AutoCAD.Interop.AcadDocument)doc.AcadDocument;
 acaddoc.BeginDoubleClick += new _DAcadDocumentEvents_BeginDoubleClickEventHandler(acaddoc_BeginDoubleClick);

NOT like below:
 AcadDocument acaddoc = (AcadDocument)doc.AcadDocument;
 acaddoc.BeginDoubleClick += new _DAcadDocumentEvents_BeginDoubleClickEventHandler(acaddoc_BeginDoubleClick);

The below one can only work well about 3 times in a new/open drawing. It wastes me a whole day to find out! From 8:00PM to 2:00AM.

I think this should be a .NET API defect!