void xyslider()
{
	// Example of macro featuring two sliders
	TH2F *hpxpy = new TH2F("hpxpy", "py vs px", 100, -2, 2, 100, -2, 2);
	
	TRandom r;
	double a, b;
   
	for (int i = 0; i < 10000; i++)
	{
		r.Rannor(a, b);
		hpxpy -> Fill(a, b);
	}
   
   
	TCanvas *c1 = new TCanvas("c1");
	TPad *pad = new TPad("pad","Color plot pad",0.1,0.1,0.98,0.98);
	pad->Draw();
	pad->cd();
	hpxpy->Draw("COLZ");
	c1->cd();
 
  // Create two sliders in main canvas. When button1 will be released
  // the macro action.C will be called.
	TSlider *xslider = new TSlider("xslider","x",0.1,0.02,0.98,0.08);
	xslider->SetMethod(".x action.C");
	TSlider *yslider = new TSlider("yslider","y",0.02,0.1,0.06,0.98);
	yslider->SetMethod(".x action.C");
}