void testUpdate(){

	//gStyle->SetTitleAlign(20);
	//gStyle->SetTitleBorderSize(0);

	TH1F * h1 = new TH1F("h1", "h1", 10, 0, 10);
	TH1F * h2 = new TH1F("h2", "h2", 10, 0, 20);
	TH1F * h3 = new TH1F("h3", "h3", 10, 0, 30);
	TH1F * h4 = new TH1F("h4", "h4", 10, 0, 40);

	TCanvas* c = new TCanvas("c","c",50,50,1100,1100);
	c->Divide(2,2);

	TPad* currentPad = 0x0;

	currentPad = (TPad*)c->GetPad(1);
	currentPad->cd();
	currentPad->Dump();
	h1->Draw();
	currentPad->GetListOfPrimitives()->Print();
	TPaveText* title = (TPaveText*)(currentPad->GetListOfPrimitives()->At(2));
	title->SetMargin(0);
	currentPad->Update();
	currentPad->Modified();

	currentPad = (TPad*)c->GetPad(2);
	currentPad->cd();
	h2->Draw();
	TPaveText* title = (TPaveText*)(currentPad->GetListOfPrimitives()->At(2));
	title->SetMargin(0);
	currentPad->Update();
	currentPad->Modified();

	currentPad = (TPad*)c->GetPad(3);
	currentPad->cd();
	h3->Draw();
	TPaveText* title = (TPaveText*)(currentPad->GetListOfPrimitives()->At(2));
	title->SetMargin(0);
	currentPad->Update();
	currentPad->Modified();

	currentPad = (TPad*)c->GetPad(4);
	currentPad->cd();
	h4->Draw();
	TPaveText* title = (TPaveText*)(currentPad->GetListOfPrimitives()->At(2));
	title->SetMargin(0);
	currentPad->Update();
	currentPad->Modified();
	return;
}