How to create Customer papers in "HP LaserJet 1020" Programatically ?

I am use below code to create customer papers
http://www.berezniker.com/content/pages/visual-foxpro/add-and-delete-custom-printer-forms

* All sizes in inches
LOCAL lcPrintername
lcPrintername = GETPRINTER()
WAIT WINDOW lcPrintername  NOWAIT
IF EMPTY(lcPrintername)
   MESSAGEBOX("Please Select a Printer ",0+64,"Alert !!")
   RETURN
ENDIF

ooo = NEWOBJECT("AddPrinterForm", "AddPrinterFormClass.fxp")

IF NOT ooo.AddForm("8x6", 8,6, lcPrintername)
   MESSAGEBOX(ooo.cErrorMessage+CHR(13)+ooo.cApiErrorMessage,0+64,"Alert !!")
ENDIF
ooo = NULL

with above code When we select Dot-Matrix printer it is showing size 8x6, but with HP "LaserJet 1020" not showing.

If we create custom paper manually in "HP LaserJet 1020" then it is showing 8x6 in paper list of "HP LaserJet 1020"

Image Attached

Warm regards,
mk.