Adobe 9 combined files order

I have combined a PDF (ONE MERGED FILE) with several stand alone pdfs with Adobe Acrobat Professional 8.  Please note that the order of these stand alone files in the combined PDF is customized.  However, when I open this combined PDF with Adobe Acrobat Reader 9, the order of these stand alone files within the combined PDF is automatically sorted in alphabetical order.  My question is,

Is there any settings in Adobe 9 that I can choose so that it will not sort automatically in alphabetical order when open the combined PDF in Adobe 9?  Thank you!