Some ActiveX Control do not allow themself to be access from a development plateform.
Assuming your control allows you to do so, drop an activeX container in your labview control panel, then right click on it to connect the desire activeX control. Then get to the property browser (if available) to set the properties. Check ni website for example how to do this. I seem to remember an example using internet explorer activeX control to diasplay a web page.
PJM