How to show different parts in the plot in RooFit, just like TLegned in Root

Roofit and RooStats
1

i use a gauss plus 2nd chebychev to fit data in roofit. i want to show the red line is gauss, blue line is 2nd chebychev, and black line is data in the plot, just like TLegend in root. how should do that? Thanks

2

May be gPad->BuildLegend()

3

Thanks, i will try it.