How to get Page Number from a PDPage

[Wulf Berschin]

Hi,

how do I get the page number of a PDPageXYDestination which returns a 
PDPage?

I saw that PDDocument holds a pageMap which maps object/generationnumber 
to page numbers but, unfortunately I don't see a way how to get this 
object/generationnumber of a PDPage, but porbably I am off the track...

Thanks, Wulf