Resizing Contents Within Internal Frame

I have a JInternalFrame and within it I put a JTextArea which is inside of a JScrollPane. The code for that part is below:

txt =new JTextArea();

txt.setEditable(false);

txt.setPreferredSize(new Dimension(500, 40000));

scrollPane =new JScrollPane(txt);

BoxLayout paneLayout =new BoxLayout(getContentPane(), BoxLayout.Y_AXIS);

getContentPane().setLayout(paneLayout);

getContentPane().add(scrollPane);

this.addComponentListener(this);

I have code that listens for when the internal frame is resized and then I adjust the JTextArea accordingly. It initially resizes the way I want it to but then after I release the mouse button, The JtextArea resizes itself to fit the JInternalFrame it is in. How can I stop this so that it stays the size that I want it to change to?

[1027 byte] By [lesnaubra] at [2007-11-27 9:14:59]