How does the pop-up window vtkOutputWindow

When using VS + QT + VTK, it will pop up when you run the program vtkOutputWindow window, although not affect the operation, but for obsessive-compulsive disorder who looked very uncomfortable, the following solution is how it does not pop up.

I am using QtGUIApplication
added #include "vtkoutputwindow.h" above the main function
added vtkOutputWindow :: SetGlobalWarningDisplay (0) in the first line of the main function;
as follows:

#include "QtGuiApplication5.h"
#include <QtWidgets/QApplication>
#include "vtkoutputwindow.h"         //加入
int main(int argc, char *argv[])
{
	vtkOutputWindow::SetGlobalWarningDisplay(0);     //加入
	QApplication a(argc, argv);
	QtGuiApplication5 w;
	w.show();
	return a.exec();
}

And then run the program and found no longer pop up