This is a known issue identified in the original version of the Paper Type Editor. There were plans to allow individual printers to have paper types, however, this feature was never implemented. The Paper Type Editor was never changed to reflect this, and so the reason for the message "...Printer doesn't contain any paper types" when selecting a specific printer.
The Paper Type Editor will be revised (in the next major release of QuickDraw GX) so that specific printers WILL NOT show up in the list. In the interim, the simple workaround is to ignore individual printers and select "LaserWriter GX" for any network LaserWriter printer.
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