SWT (mouse)ScrollBar not working while scrolling through the results set

Question

I am using SWT ScrollBar/Slider to scroll through my resultset. When I use the vertical scroll bar(see pic), it allows me to scroll through the results without any problem. But when I use mouse scroll, it gets stuck after fetching a certain no. of rows, and now if I go back to using the vertical scroll, it allows me to scroll through the remaining results.

ScrollBar sbar = this.getVerticalBar();
    if (sbar != null)
    {
        sbar.setEnabled(true);
        sbar.setVisible(false);
        sbar.setValues(4, 0, 10, 1, 1, 3);
        sbar.addSelectionListener(new SelectionListener()
        {
            public void widgetSelected(SelectionEvent e)
            {
                // Cancels editing
                cancelEdit(true);
          
                final int selection = ((ScrollBar)e.widget).getSelection();
                m_vertBar.setSelection(selection);
                GridSWT.this.vScrollTo(selection);
            }

            public void widgetDefaultSelected(SelectionEvent e)
            {
            }
        });
    }

Can anyone pls help me fix it? Would be really helpful.

Thanks, Ashishenter image description here