VB.NET and Acrobat 5.0 ActiveX - PDF.ocx

I am using VB.NET which has include Acrobat 5.0 ActiveX - PDF.ocx and I create a button on the screen. When I click on button and try open pdf.ocx,
I get his error message - "An error occurred while processing this command. Attempted to read or write protected memory. This is often an indication that other memory is corrupt".

I go to VB Design view and right click on button and I can't open the property. Does anybody know what happens and how to look at the property?
Thank you.

Ed