JDialog won't display the another class with Components in JPanel

[Derek Varghese]

I have a main program that has a button. Upon clicking the button Jdialog is loaded with JPanel components from Tvpanel.java.
The problem I am having is the JDialog doesn't display the Tvpanel(). I am using the Windowbuilder in Eclipse.
The JDialog comes up with the Title BUT I can't view the contents.
Would appreciate any help.
Thanks.

import java.awt.BorderLayout;

public class [b]MainFrame [/b]extends JFrame implements ActionListener{
	
	static JFrame frame;
	JPanel panel;
		/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					frame = new MainFrame();
					frame.setSize(500, 150); 
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MainFrame() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//setBounds(100, 100, 450, 300);
		
		getContentPane().setLayout(new BorderLayout()); 
		panel = new JPanel();
		getContentPane().add(panel, BorderLayout.CENTER);
		GridBagLayout gbl_panel = new GridBagLayout();
		gbl_panel.columnWidths = new int[]{0};
		gbl_panel.rowHeights = new int[]{0};
		gbl_panel.columnWeights = new double[]{Double.MIN_VALUE};
		gbl_panel.rowWeights = new double[]{Double.MIN_VALUE};
		panel.setLayout(gbl_panel);
		
		JButton btnNewButton = new JButton("New button");
		panel.setLayout(new CardLayout(50,50));
		panel.add(btnNewButton, "button");
		
		btnNewButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
								
				JDialog dialog = new JDialog(frame, "T-V Bandpass Parameters");
				VsfTVpanel tvpanel = new VsfTVpanel();
				
				if (frame!=null)
				{
					Dimension framesize = frame.getSize();
					Point p = frame.getLocation();
					setLocation(p.x+framesize.width/4,p.y+framesize.height/4);
				}
				
				//dialog.setSize(new Dimension(750, 365));
	            //change the layout of the top level pane and nest the previously created panel
				//dialog.getContentPane().setLayout(new FlowLayout(FlowLayout.LEADING)); // just do this once
				dialog.add(tvpanel);
				dialog.pack(); // call this so that the dialog will resize to accommodate your components.
				//dialog.setResizable(false); 			 	  
				// tvpanel.set_thisDialog(dialog);
				 
		       //dialog.pack();
				/*int w = Toolkit.getDefaultToolkit().getScreenSize().width;
				int h = Toolkit.getDefaultToolkit().getScreenSize().height;
				dialog.setLocation(0, h - 400);*/
				//dialog.setLocationRelativeTo(frame);   
				dialog.setVisible( true );
				
			}

			
		});
		pack();
		//setBounds(100, 100, 750, 300);
		//super.repaint();
		
	}

	/* (non-Javadoc)
	 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
	 */
	@Override
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		
	}
}
/****************************/

import java.awt.EventQueue;

public class[b] VsfTVpanel [/b]extends JPanel implements ActionListener, ItemListener {
	private JTextField textField;
	
	private JPanel _pnlTVBandpassfilter;
	private JTable _table;
	private JTextField _txtFieldLowcut;
	
	/**
	 * Create the panel.
	 */
	public VsfTVpanel() {
		
		super();
		
		_pnlTVBandpassfilter = new JPanel();
		_pnlTVBandpassfilter.setBounds(100, 100, 668, 578);
		_pnlTVBandpassfilter.setLayout(new FormLayout(new ColumnSpec[] {
				ColumnSpec.decode("max(12dlu;default)"),
				new ColumnSpec(ColumnSpec.FILL, Sizes.bounded(Sizes.DEFAULT, Sizes.constant("94dlu", true), Sizes.constant("75dlu", true)), 1),
				ColumnSpec.decode("31dlu"),
				ColumnSpec.decode("right:6dlu"),
				ColumnSpec.decode("max(6dlu;default)"),
				ColumnSpec.decode("max(8dlu;default)"),
				ColumnSpec.decode("5dlu"),
				ColumnSpec.decode("default:grow"),
				FormFactory.DEFAULT_COLSPEC,},
			new RowSpec[] {
				RowSpec.decode("1px"),
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.RELATED_GAP_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.RELATED_GAP_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.RELATED_GAP_ROWSPEC,
				RowSpec.decode("max(80dlu;min)"),
				FormFactory.RELATED_GAP_ROWSPEC,
				RowSpec.decode("max(15dlu;default)"),
				new RowSpec(RowSpec.FILL, Sizes.bounded(Sizes.DEFAULT, Sizes.constant("80dlu", false), Sizes.constant("16dlu", false)), 1),
				RowSpec.decode("max(16dlu;default)"),
				FormFactory.DEFAULT_ROWSPEC,
				FormFactory.DEFAULT_ROWSPEC,}));
		
		JPanel _pnlMain = new JPanel();
		_pnlTVBandpassfilter.add(_pnlMain, "1, 1, fill, top");
		_pnlMain.setLayout(new FormLayout(new ColumnSpec[] {},
			new RowSpec[] {}));
		
		JLabel lblNewLabel = new JLabel("Test JDialog");
		_pnlTVBandpassfilter.add(lblNewLabel, "2, 7");
		
		JButton btnNewButton = new JButton("Load !!");
		_pnlTVBandpassfilter.add(btnNewButton, "2, 11");
		
	//	_pnlTVBandpassfilter.setVisible(true);
		
	}

	/*@Override
	public void getData() throws BadLocationException {
		// TODO Auto-generated method stub
	}

	@Override
	public String getName() {
		// TODO Auto-generated method stub
		return "T-V BandPass Filter";
	}

	@Override
	public boolean setData() {
		// TODO Auto-generated method stub
		return false;
	}*/
			
	
	/* (non-Javadoc)
	 * @see java.awt.event.ItemListener#itemStateChanged(java.awt.event.ItemEvent)
	 */
	@Override
	public void itemStateChanged(ItemEvent arg0) {
		// TODO Auto-generated method stub
	}

	/* (non-Javadoc)
	 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
	 */
	@Override
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		
	}
}