changing line thickness for a fitted line

From: Wolfgang Korsch (wkorsch@server1.pa.uky.edu)
Date: Mon Sep 29 1997 - 15:59:37 MEST 

   Hi,
     I do lots of data fitting and I use the follogin procdeure:
     
    a) gr = new TGraphErrors(n,x,y,dx,dy);
       gr->Draw("P");
       
    c)  TF1 *f1 = new TF1("f1","my fit function",xrange, yrange); 
    d)  first guess of fit parameters
    e) gr->Fit("f1", "A");
    
    
    That all works fine, but then I would like to change the line
    thickness and color of the fitted curve, but I can only move it !!
    If I move the curve, actually I click on the curve and it seems to
    move the data points, then I can change the line thickness/color
    of the fitted curve. (I want to do the changes interactively, i.e.
    I click on the curve and open 'line attributes').
    Is that a bug? How can I get around it? 
    
    Thanks
       Wolfgang

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