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How update the group of TF1s

I have a bunch of TF1’s that share common parameters, each TF1 is on separate pad. I would like to have something like FitPanel for this. I wrote some GUI but there is problem - how can I update the TF1?
I tried TF1::Update and also TVirtualPad::Update but it doesn;t work, function is plotted with new parameters only when I resize TCanvas.

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Try: gPad->Modified(); gPad->Update();

Thanks it works.