JFrame from JApplet won't appear as it should

Hi to all,
I have created a JApplet, that contains some buttons. When a button is clicked, a JFrame should be displayed. I am experiencing the following problem: a short blue bar (containing the minimize, maximaze and close button) is the only thing being displayed. When I maximize it, I can not see what should be inside the JFrame (no matter if it has a null or XYLayout).
Does anybody know what could be happening??? To display the Jframe I'm using the following code:
    existingJframe.getContentPane();
    existingJframe.pack();
    existingJframe.setVisible(true);
    existingJframe.setLocation(100,200);
    existingJframe.repaint();Thanks a lot

what happens if you display a JDialog instead of a JFrame here?

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JFrame from JApplet won't appear as it should

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