Thanks folks.
Here is the original DLL and one of the modified one.
SystemeD, error message was the standard frameword .net error. Because it occured at compiling time, not at running time.
I'll test the method of
jjhsd. But as you said, this method won't work on ASP .NET (The dlls are for ASP .NET, but I'm now sure written by ASP .NET). So what's the solution?
I couln't upload the files. Upload manager window hangs

So uploaded to GeoCities.
hxxp://www.geocities.com/newbie_cracker_ms/RadTreeView_Original.zip
hxxp://www.geocities.com/newbie_cracker_ms/RadTreeView_message_jump.zip