JScrollPane and ViewPorts containing JPanels

Right

I'm not having much luck with this thing I'm trying to build:

I need to build a Screen where the Column and Row Headers do not move merely scroll along with the COntents of the main area.

Now i have this kind of set up:

Code:

---

public class Matrix extends JScrollPane{

    public Matrix(InterestMatrix im, ArrayList customers, ArrayList products) {
        this.setViewportView(new CentralMatrix(im, customers, products));
        this.setColumnHeaderView(new HeaderMatrix(customers, HeaderMatrix.MATRIX_HORIZONTAL, HeaderResult.TYPE_CUSTOMER));
        this.setRowHeaderView(new HeaderMatrix(products, HeaderMatrix.MATRIX_VERTICAL, HeaderResult.TYPE_PRODUCT));
        this.repaint();
    }
}

---

Each of the HEader MAtrix and Central Matrix return JPanel's

NOw i thought this would work, but it dosen't...

IS it becuase the object i am addign to the Viewport do not have Layout Managers? i had to set these to NULL so i could add my components easily to set locatiosn etc....

IS this making sense?!

Just wondering if the Layouts Managers would give me the problem, or wheteher i am missing something fundamental in my approach.


Cheers for any advice, or links to JScrollPane, ViewPort Tutorial etc...

Andy