wait(){
   h = new TH1F ("h", "h", 10, 0, 1);
   h->Draw();
   for (Int_t i = 0; i < 10; ++i)
   {
      h->Fill(i/10.);
      c1->Modified();
      c1->Update();
      c1->WaitPrimitive();
      cout << i << endl;
   }
}