Viewing PDF generated using PDFNet files in Illustrator

When I create a PDF using text with a system font, the PDF looks fine
in Acrobat Reader (Reader file properties list the system font and
being embedded). However, when I view the PDF in Illustrator, I get
the following error messages that pop up...any idea what might be

The font Helvetica-Condensed is missing. Affected text will be
displayed using a substitute font.

Basically Illustrator complains that all fonts are not embedded in the
document. You could go around this by embedding all fonts (i.e. make
sure that embed flag in Font.Create???() methods is set to 'true').