popupFrame.setTitle(windowName);
popupFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
int width = 640, height = 480;
Dimension scrDim = Toolkit.getDefaultToolkit().getScreenSize();
popupFrame.setBounds((scrDim.width - width) / 2, (scrDim.height - height) / 2, width, height);
popupGraph.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
popupGraph.mouseClicked(e);
}