Error bar of a histogram in a Ttree object

Hey,
I have working on the histograms of a Ttree object(by setting a THistogran pointer to the tree). My question is, how can you obtain the error bar of the histo and display the errror bar along with the original histograms?
It would be best if you can point out some reference I can read as I am new to the root program.
Thanks a lot!!!

THistPainter

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