Hi ,

im trying to use a gridbag constraing layout.

I want to add 2 Jpannels and 2 Jbuttons.  But the panels do not appear on the screen just the buttons.    All other layout managers add my panels fine.

any ideas?
JInternalFrame fr1 =
     new JInternalFrame("app", true, true);
 fr1.setBounds(0, 05, 900, 900);
 Container cn = fr1.getContentPane();
 cn.setLayout(new GridBagLayout());

 GridBagConstraints c = new GridBagConstraints();

c.gridx=0;
c.gridy=0;
cn.add(a,c); //button
 
c.gridx=0;
c.gridy=1;
cn.add(b,c); //button
 
c.gridx=0;
c.gridy=2;
cn.add(ca,c);  //button

c.gridx=0;
c.gridy=3;
cn.add(a,c);   //button
 
c.gridx=1;
c.gridy=1;
cn.add(panelb,c); //panel

c.gridx=1;
c.gridy=2;
cn.add(panela,c); //panel