TH2::ShowProjectionY seems to reuse the same canvas irrespectively of the fact that I invoked it for 2-nd histogram and that 2nd canvas has been created automacilly. So, I have two 2D histograms and when I roll mouse over bins in one or another projection is updated in the same “projection” canvas. Couldn’t it remember which histogram it is invoked from and where to draw projections ?
THistPainter::ShowProjectionY reuse the extra canvas if it exits. When you want to restart a new projection you should close the extra canvas.
I figured this one out al right 
Real question is:
if this behaviour is by desing, then why is extra “extra canvas” created at all ?
Either use 2nd extra canvas - or don’t create it all - would be my guess.
Hi Khamit,
What you request makes sense. Now implemented in CVS
Rene
thank you