Center Title of TMultiGraph

ROOT
1

I want to center the titles of both x- and y-axes in TMultiGraph, but I can’t do it. Can anyone help me please?
Thanks.

2 
   multigraph->GetYaxis()->SetTitle("Y-axis");
   multigraph->GetYaxis()->CenterTitle(true);
   multigraph->GetXaxis()->SetTitle("X-axis");
   multigraph->GetXaxis()->CenterTitle(true);
3

Thank you very much for your help.