I want to create another QGLWidget which opens as a new window.

ProjectedHand.h
@#ifndef _GLWIDGET_H
#define _GLWIDGET_H

#include <QtOpenGL/QGLWidget>
#include <QDebug>

class ProjectedHand : public QGLWidget {

Q_OBJECT // must include this if you use Qt signals/slots

public:
ProjectedHand(QWidget *parent = NULL);

protected:
void initializeGL();
void resizeGL(int w, int h);
void paintGL();
};

#endif /* _GLWIDGET_H */@

ProjectedHand.cpp
@#include <QtGui/QMouseEvent>
#include "ProjectedHand.h"

ProjectedHand::ProjectedHand(QWidget *parent) : QGLWidget(parent) {

}

void ProjectedHand::initializeGL() {
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
}

void ProjectedHand::resizeGL(int w, int h) {

}
void ProjectedHand::paintGL() {
static bool screenOnBlank = false;
if (!screenOnBlank) {
qDebug("Painting grey-ness");
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
screenOnBlank = true;
}
}@

Then, from another class, I call:
@ProjectedHand *window = new ProjectedHand(NULL);
window->resize(800,600);
window->show();@

It gives me a popup, but the window is not blank. It's a window containing a distorted view of what I see on my main window.