Is it different in use of activex between VC and VB ?

Hi. I am working with ocx control,e.g. *HANDLER* ocx, which was made as VC project. It was used as base ocx control of other ocx control,e.g. *UI* ocx. In my VC project, I had inserted handler ocx as base. Then some event handler of handler ocx had not work properly. But VB sample UI ocx or EXE using handler ocx was working. So have tried many things over and over. Finally I have tested same functionality of handler ocx in VB EXE project. WOOPS! This sample project is working nice. What was the problem ?
What's the difference ? I want to use handler ocx in VC project. Help me and any comment will makes me happy. Thanks.

[WORKING SITUATION]

|----- UI OCX or EXE IN VB ------|
|#############################|
|##### INSERTED HANDLER OCX #####|
|#############################|

[PROBLEM SITUATION]

|-------- UI EXE IN VC ----------|
|#############################|
|##### INSERTED HANDLER OCX #####|
|#############################|

Thans for your attention.

ktpark