Auto-scrolling doesn't work when JFrame is not visible

Hi, I have auto-scrolling implemented for my JTextPane that sits in JScrollPane - which lives in JInternalFrame. It works as excepted - as long as my application's JFrame is visible. When the JFrame becomes invisible, auto-scrolling simply doesn't work anymore.
I've overcame this by scrolling down in "windowShown", but it's ugly because the user can visually see the scroll down when using this workaround (it jumps).
I guess this is Swing's optimization, but I would really like to overcome it in someway. But it seems I'm not enough a swing hacker to do it.
One thing to note is thtat, the auto-scrolling works fine when the JInternalFrame is NOT visible, but frame is.
I've tried to override the isShowing-method of JInternalFrame, with no luck.
Here's my scrolling method:
public static void scrollDown(JScrollPane scroll) {
          JViewport port = scroll.getViewport();
          Rectangle rect = new Rectangle(0, port.getViewSize().height, 1, 1);
          port.scrollRectToVisible(rect);
          JScrollBar bar = scroll.getVerticalScrollBar();
          bar.setValue(bar.getMaximum() - bar.getModel().getExtent());
     }Anyone have ideas?

At some point I had really hard time getting the auto-scrolling to work, as I got these weird little bumps after scrolling down.
Adding scrollBar.setValue() seemed to 'just fix it'. It actually seems to be superfluous now.
The scrolling is already wrapped in SwingUtilities.invokeLater() - in conjuction with printing text into the JTextPane and it works OK.
I had some wrong info in the first post, the viewport actually does get scrolled down even when the JFrame is not visible. And by visible I mean JFrame.setVisible(false) - my application has a minimize-to-tray feature, which hides the JFrame.
So I think the problem is 'just' a repainting problem. When the frame is shown, the previous scroll location is first displayed, and then a repaint is triggered that causes the 'jump down'.
I'm not still sure how to fix it though.

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Hi Mikhail Maksyuta,
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