Count histogram entries within a region given by a TCutG

I would like to count the entries of a 2D Histogram within a region given by a graphical cut (TCutG).

With myHisto->Draw("[mycut]"); I can draw a histogram where only the selected bins appear, but the statistics window still gives the total number of entries in the Histogram (not only those which passed the cut).

Using TH2F::Integral also doesn’t help me to get the number of events passing the cut.

How to I get the number of entries left over by the cut?

Cheers, J.

your_cutg->Integral(h2); … G:Integral