cannot use vpXF, vpYF, vpWidthF, and vpHeightF to make panel plots

Dear all

I can use gsn_panel to generate a panel plot, but cannot use vpXF, vpYF, vpWidthF, and vpHeightF to make the panel plot.
 
I attached my script, which only generate a plot with only one panel.

If I comment out draw(plot(ifile_loop)) and frame(wks)
and un-comment out
; resP = True ; modify the panel plot
; resP@txString = "Vetical velocity"
; gsn_panel(wks,plot,(/2,1/),resP)

Then the script would generate a plot with two panels.

I prefer to use vpXF, vpYF, vpWidthF, and vpHeightF to generate the panel plot since I can exactly put the panels wherever I want.

Any suggestions?

Thanks
Xiaoming

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