void bug_THStack(void)
{
   c_bug_THStack = new TCanvas("c_bug_THStack", "THStack bug");
   c_bug_THStack->Divide(2,1);
   h = new TH1F("h", "h", 2, 0, 2);
   hs = new THStack("hs", "without nostack");
   hs->Add(h);
   h->Fill(.5, 1);
   c_bug_THStack->cd(1);
   hs->Draw("");
   hs_nostack = new THStack("hs_nostack", "with nostack");
   hs_nostack->Add(h);
   c_bug_THStack->cd(2);
   hs_nostack->Draw("nostack");
}