Using ActiveX Controls (created in VB)

hello,
i want to  use an ActiveX Control which i created in VisualBasic in my C++
Builder Project.
Now my Problem is that i get a EAccessViolation (in C++ Builder) every time
i want to call a Method of my ActiveX Control!!
an error occures which is sometimes in the file msvbvm60.dll

can anyone tell me what the problem could be?? is it the way i implement it
in C++ Builder or do i have to change something in my ActiveX Control
(VB-Project) ??? THANKS A LOT!!!

simon