Are you using an ActiveX control - an object on the front panel - or an ActiveX class that you access through Automation Open? Note that while they look similar on the block diagram, if you have a class with no associated control then you won't see it when you try to place an ActiveX object on the front panel.
Also, be sure to register the ActiveX control before you do anything. You may have to install a driver that does this or you could manually do it as well. Contact the manufacturer to get the appropriate driver. Instructions to manually install are here:
How to register an ActiveX control (.ocx) manually
