Adobe Reader X (10.0) ActiveX: annotations are disabled

I just embedded Adobe Reader X ActiveX control in a small sample applications. All controls related to Annotati开发者_运维百科ons and Comments are disabled.

Why is that? Can I enable them via code?

This behavior seems to be intensionally and can't be changed. The answer from Adobe can be found here: http://forums.adobe.com/thread/757876

My case was simple, uninstalled and installed the latest version and the same pdf file was open to be annotated.