Draw borders between bins in TH2F

ROOT
4

It is not foreseen as an option. But it is simple to do:

void drawgrid()
{
   double xs = 0.2; // grid step along X
   double ys = 0.2; // grid step along Y
   double xmin,ymin,xmax,ymax;
   gPad->GetRangeAxis(xmin,ymin,xmax,ymax);
   auto aline = new TLine();
   aline->SetLineStyle(3);
   for (double yg = ymin+ys; yg < ymax; yg=yg+ys) aline->PaintLine(xmin,yg,xmax,yg);
   for (double xg = xmin+xs; xg < xmax; xg=xg+xs) aline->PaintLine(xg,ymin,xg,ymax);
}

void customgrid()
{
   gStyle->SetOptStat(0);
   auto h = new TH2D("h","",10,0,10,10,0,10);
   h->Draw();
   h->GetXaxis()->SetRangeUser(2,8);
   gPad->Update();

   auto grid = new TExec("grid","drawgrid()");
   grid->Draw();
}
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