BCB4 ActiveX -> VC6 problem

I'm use ActiveForm to build some GUI this TPageControl on form and some
controls on
each TabSheet, so this ActiveX work properly in RCB4 applications and in
Control Test Container
but in VC6 MFC application not work, when I click on some control on
TabSheet it freezy
100% CPU and application not respond. Other controls in same ActiveX, not on
TabSheet , works properly. Why???