RooFit: how to import weighted dataset

Hello friends,

in the latest version of roofit (root 5.26) function RooDataSet::setWeightVar() was deprecated and now I have a problem to import text file with 'weight' column. To show a problem I prepare short script, which follows documentation from: http://root.cern.ch/root/html526/RooDataSet.html#RooDataSet:RooDataSet%2

but do not work. Can you take a look?
I am expecting that "sumEntries" in script output have to be sum of all weights of input file.

Thanks,
Anton