//BorderLayout layout = new BorderLayout();
//this.setLayout(layout);
this.setFocusable(true);
this.requestFocus();
Canvas3D c3d = new Canvas3D(SimpleUniverse.getPreferredConfiguration());
c3d.setSize(PANEL_WIDTH, (2*PANEL_HEIGHT)/3);
panelCanvas.add(c3d);
panelCanvas.setOpaque(false);
panelCanvas.setPreferredSize(new Dimension(PANEL_WIDTH, (2*PANEL_HEIGHT)/3));
panelCanvas.setFocusable(false);