Vector-contours overlay

Hi all,

My aim is to plot 3 quantities in the same panel; 1.Wind vectors,
2.SST(shaded contours) and OLR (contours). the plot section of my script
looks something like this...

res = True
res_at_gsnDraw = False
res_at_gsnFrame = False
..........
..........
plot1=gsn_csm_vector_scalar_map_ce(wks,u10jjas,v10jjas,sstjjas,res)
plot2=gsn_csm_contour_map_ce(wks,olrjjas,res)
overlay(plot1,plot2)
draw(plot1)
frame(wks)

The error I get is "fatal:NhlAddOverlay: plot class mapPlotClass cannot
be overlay plot member". I couldn't figure out what is wrong. Is there a
way this can be accomplished?

Thanks in advance
prince

-- 
Prince K. XAVIER		
Laboratoire de Meteorologie Dynamique
Ecole Normale Superieure
24 Rue Lhomond 75231 Paris 
cedex 05 FRANCE
Tel: +33 (0)1 44 32 22 32
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