JInternalFrame Problem: not showing the frame properly

[Sagar Rohankar]

Hi all,
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)
Main class:

public class MyMain extends JFrame
{
	JDesktopPane jDesktopPane;

	public MyMain()
	{
		
		jDesktopPane = new JDesktopPane();
		getContentPane().add(jDesktopPane, BorderLayout.CENTER);
	}

	private void jButton2ActionPerformed(java.awt.event.ActionEvent evt)
	{
		JInternalFrame jif = new JInternalFrame();

		// set properties
		jif.setClosable(true);
		jif.setMaximizable(true);
		jif.setIconifiable(true);
		jif.setResizable(true);
		jif.setBounds(120, 80, 800, 500);

		// j3dPanel is the instance varible
		j3dPanel = new J3DPanel(this);

		jif.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		jif.setContentPane(j3dPanel);

		jDesktopPane.add(jif, 1);

		// Set this internal frame to be selected

		try
		{
			jif.setSelected(true);
		}
		catch (java.beans.PropertyVetoException e2)
		{
		}
		jif.show();

	}
	
}

The Java 3D JPanel

public J3DPanel extends JPanel
{
	/**
	 * The SimpleUniverse object
	 */
	protected SimpleUniverse	univ;

	/**
	 * The root BranchGroup Object.
	 */
	private BranchGroup			scene;

	/**
	 * Panel for placing the boxes
	 */
	private JPanel				drawingPanel;

	public J3DPanel(Container container) throws Exception
	{

		// Initialize the GUI components
		JPopupMenu.setDefaultLightWeightPopupEnabled(false);

		// Initialize the Panel for drawing and holding the boxes
		initComponents();

		// Create Canvas3D and SimpleUniverse
		Canvas3D c = createUniverse(container);
		// Add canvas to drawing panel
		drawingPanel.add(c, BorderLayout.CENTER);
		// Initialize the box dimensions

		scene = new BranchGroup();

	}
}

What's the wrong I'm doing here, any pointers will be greatly appreciated .

[Sagar Rohankar]

OK, here is the screenshot I had taken for the same problem,

Any hints/suggestions?