This seems to be the way TTree::Draw() is written for 2-dim distributions. I don't know why, probably it would be better to call EventLoop with action = 2 if the user supplies pre-defined histogram to fill (not action=-2 as it is done now). A simple workaround is to call TTree::Draw() without supplying any options ("lego" in your case), then draw your TH2F with any options you like. Or, if you do need to have some options in the call to TTree::Draw() ("goff" for example), append "same" to them. - Dmitry.
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