Problems with disappearing JTextArea when activating JMenu

Im having trouble with using JTextArea in conjunction with JMenu and JInternalFrame. I have a program that uses JInternalFrames for navigation, when the navigation been used I set the JInternalFrame to setVisible(false) and display a JMenuBar with several components and a JTextArea. The JTextArea gets displayed as it should and so is the JMenuBar but when a JMenuItem has been activated the JTextArea becomes invisible or partly invisible. Anyone have any suggestions?
//Function that removes the JInternalFrame and adds the JMenuBar and JTextArea to the program
public void ordBehandlare()
               ramnav.setVisible(false); //ramnav == JInternalFrame
               Container cont = getContentPane();
               cont.add(ordbehandlarArea); //ordbehandlarArea == JTextArea
               setJMenuBar(ordBehandBar); //ordBehandBar == JMenuBar
Grateful for any answers...

From the 5 lines of code you posted I have no idea whats wrong, but I'm sure you can create a 20 line program that we can compile and execute that demonstrates your problem. Chances are while your creating this simple program you will find your error.

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Problems with disappearing JTextArea when activating JMenu

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