Can't access the "status" box of TGraph

[Wile_E_Coyote]

Try:

// ...
Lccd_st->SetName("mystatus"); // actually, you do not need it
gr->GetListOfFunctions()->Remove(Lccd_st); Lccd_st->Draw();
//...

P.S. Note that the TStyle::SetOptStat method is relevant for histograms only (see also the TH1::SetStats method).