How can I superimpose several graphs on top of existing graph?

From: Jayoung Wu (jayoung@glue.umd.edu)
Date: Tue Mar 10 1998 - 17:16:54 MET 

Hi,
I would like to plot two graphs on a plot using "TGraph". How I can do it?
========================== part of my code ====================
...

TGraph *gr0 = new TGraph(pnoy,iypos,pzzy);
TGraph *gr = new TGraph(pnoy,pypos,pzzy);

    pad0->Draw();
    pad0->cd();
    Float_t xr[2] = {-23.0,23.0};
    Float_t yr[2] = {-25,48.25};
    Int_t nch = 2;
    gr0->PaintGraph(nch,xr,yr,"AP");
    gr0->Draw("AL*");

    gr->SetMarkerColor(4);
    gr->SetMarkerStyle(21);
    gr->Draw("Same");

    pad0->Modified();
================================================================
When I execute the macro, it plot only "gr0" not "gr" without any warning
or error message. Do you have any idea?
TF1 seems to be able to superimpose a plot on top of existing picture.
Is TGraph able to do it?

---
Thanks a lot!
Jayoung

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