This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
till recently, I'm creating the instance of JFrame on button click to show the Java 3D output which is embed into the JPanel.
Now when I modify the same code for JInternalFrame, it showing the 3D output panel but NOT displaying the "close", "maximize" and "minimize" buttons with the frame border.
Here is my code snippet (I post the code of interest only, the file has 1200 LOC)