Hello Rene, > At least one advantage of deriving from a common base class TObject. > You can do > Histo_List[0])->Draw(); I tried your example and it doesn't work for me. Here's what I got: root [0] TH1D* h = new TH1D() root [1] h->Draw() <- this draw is ok <TCanvas::MakeDefCanvas>: created default TCanvas with name c1 root [2] TObjArray *t = new TObjArray() root [3] t->GetEntries() (const Int_t)0 root [4] t->Add(h) root [5] t->GetEntries() (const Int_t)1 root [6] t[0])->Draw() <- this draw is not ok !!!Bad command input. Ignored!!! root [7] ((TH1D*) t[0])->Draw() <- this draw is ok Am I missing something? thanks, Henrique **************************************** State University at Campinas - BRASIL "Gleb Wathagin" Physics Institute Department of Cosmic Rays and Chronology Henrique Barbosa The Pierre Auger PhD Student Observatory ****************************************
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