RooGenericPdf built for other Pdfs

Hi,

In RooFit is it possible to consturct a RooGenericPdf that contains other RooGenericPdfs as arguments. For example, is it possible to have:

RooGenericPdf Tot(“Tot”,“Tot”, “Sig * Sto”, RooArgList(Sig,Sto)) ;

Where Sig and Sto are also RooGenericPdfs?

Thanks,
David