--- JOGLTabbedPaneUsage.java	2013-10-25 05:27:27.291184500 +0200
+++ JOGLTabbedPaneUsage.java	2013-10-25 07:02:13.936633975 +0200
@@ -2,6 +2,11 @@ 
  * Copyright (C) 2013 United States Government as represented by the Administrator of the
  * National Aeronautics and Space Administration.
  * All Rights Reserved.
+ * 
+ * Copyright (C) 2013 JogAmp Community. All rights reserved.
+ *
+ * If you guys send me code w/o further declaration it is
+ * under the 'BSD License' !
  */
 
 // package gov.nasa.worldwindx.examples.multiwindow;
@@ -18,7 +23,7 @@ 
  * @author tag
  * @version $Id$
  */
-public class JOGLTabbedPaneUsage extends JFrame
+public class JOGLTabbedPaneUsageFixed extends JFrame
 {
     int[] bufferId;
 
@@ -28,7 +33,9 @@ 
 
         public WWPanel(GLCanvas shareWith, int width, int height)
         {
-            canvas = shareWith != null ? new GLCanvas(getCaps(), shareWith.getContext()) : new GLCanvas();
+            GLContext sharedCtx = shareWith != null ? shareWith.getContext() : null;
+            System.err.println("XXX WWPanel: shareWith "+shareWith+", sharedCtx "+sharedCtx);
+            canvas = new GLCanvas(getCaps(), sharedCtx); // same caps for 1st and 2nd shared ctx !
             canvas.setSize(new java.awt.Dimension(width, height));
 
             setLayout(new BorderLayout(5, 5));
@@ -42,7 +49,12 @@ 
         @Override
         public void init(GLAutoDrawable glAutoDrawable)
         {
-//            glAutoDrawable.setGL(new DebugGL2(glAutoDrawable.getGL().getGL2()));
+            if (bufferId == null) {
+                makeVBO(glAutoDrawable);
+                System.err.println("XXX Create Buffer "+bufferId[0]);
+            } else {
+                System.err.println("XXX Reuse Buffer "+bufferId[0]);
+            }
         }
 
         @Override
@@ -53,9 +65,6 @@ 
         @Override
         public void display(GLAutoDrawable glAutoDrawable)
         {
-            if (bufferId == null)
-                makeVBO(glAutoDrawable);
-
             drawFrame(glAutoDrawable);
             glAutoDrawable.swapBuffers();
         }
@@ -88,8 +97,8 @@ 
             gl.glColor3f(1, 1, 1);
 
             gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
-            gl.glVertexPointer(3, GL2.GL_FLOAT, 0, 0);
-            gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, bufferId[0]);
+            gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, bufferId[0]); // 1st bind the VBO
+            gl.glVertexPointer(3, GL2.GL_FLOAT, 0, 0);         // 2nd use it - duh!
             gl.glDrawArrays(GL2.GL_LINES, 0, 2);
 
             gl.glFlush();
@@ -110,20 +119,24 @@ 
         gl.glBufferData(GL2.GL_ARRAY_BUFFER, vertices.capacity() * 4, vertices.rewind(), GL2.GL_STATIC_DRAW);
     }
 
-    public JOGLTabbedPaneUsage()
+    public JOGLTabbedPaneUsageFixed()
     {
         try
         {
+            GLProfile.initSingleton(); // Lets have init debug messages above below marker
+            System.err.println("XXX START DEMO XXX");
+
             // Create the application frame and the tabbed pane and add the pane to the frame.
             JTabbedPane tabbedPanel = new JTabbedPane();
             this.add(tabbedPanel, BorderLayout.CENTER);
 
             // Create two World Windows that share resources.
             WWPanel wwpA = new WWPanel(null, 600, 600);
-            WWPanel wwpB = new WWPanel(wwpA.canvas, wwpA.getWidth(), wwpA.getHeight());
+            // ctx of wwpA is 'born' @ addNotify !
+            // WWPanel wwpB = new WWPanel(wwpA.canvas, wwpA.getWidth(), wwpA.getHeight());
 
             tabbedPanel.add(wwpA, "Window A");
-            tabbedPanel.add(wwpB, "Window B");
+            // tabbedPanel.add(wwpB, "Window B");
 
             // Add the card panel to the frame.
             this.add(tabbedPanel, BorderLayout.CENTER);
@@ -133,7 +146,14 @@ 
             setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
             pack();
             setResizable(true);
+            System.err.println("XXX SetVisible XXX");
             setVisible(true);
+
+            // Now we shall be ready for wwpB - Assuming all sequential on EDT
+            WWPanel wwpB = new WWPanel(wwpA.canvas, wwpA.getWidth(), wwpA.getHeight());
+            tabbedPanel.add(wwpB, "Window B");
+            pack();
+            validate();
         }
         catch (Exception e)
         {
@@ -161,7 +181,7 @@ 
         {
             public void run()
             {
-                new JOGLTabbedPaneUsage();
+                new JOGLTabbedPaneUsageFixed();
             }
         });
     }