Hi, First as a new root user thanks to root authors to provide a free product adapted to Scientific (e.g. Particle Physics) Work!!! My problem: I call root in a C++ code. In there I succeed to open a canvas, fill histos and draw them in the canvas. Now when I go in the canvas and try to do anything interactively with the mouse, the canvas is not refreshed and the histograms don't appear any longer. How to solve that? I am working with root Version 1.01/04 4 June 1997 on HP-UX 9.x thanks in advance for help. Pascal Perrodo.
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