moblie development based on .net compact framework3 question:activeX

On how to Hosting ActiveX Controls in the .NET Compact Framework 2.0, ms did not give a answer. There are 2 solutions cfcom and openNETCF, which i have mentationed at the above post.
I have worked for two days to host Hosting a GIS ActiveX:MapX mobile in cf.
At last , i can make mapx mobile a .net cf control ,it can display at the toolbox, and i can drag it to my mobile form.
It complies well.
but when i run it , I get a Exception:
"未注册"
hResult = －2147221164
the exception occurs at the activex instance method.
did anyone come across such problem?
if u know, pls leave some info about the solution.