Hi Asko,
Thank you for using Syncfusion Products.
It is not possible to draw vertical composite field.
PdfPageNumberField and PdfCompositeField are known as dynamic fields(or automatic fields). These fields display information calculated automatically,just before the object is saved.
Hence the text will be drawn only in the horizontal mode, even though Graphics is rotated.
To know more about Dynamic/Automatic fields, Please look into our User Guide in the following link.
http://help.syncfusion.com/ug_74/pdf/DynamicFields1.htmlPlease let us know if you have any questions.
Regards,
Pravin Joshua D