Problems in loading PDF document in AcroPDF ActiveX control

Hi,

Currently I am using AcroPDF activex control provided by Acrobat Reader/Professional(9.0). There is a strange thing, when I call LoadFile to load a PDF file for the first time, there are nothing appear in the ActiveX window. I need to destroy the control and then reload that control and recall LoadFile to load the same document for the second time, then the PDF pages will appear. That is very strange.

Thanks

Alan