Deactivate Finish Button in JFace Wizards

There is an annoying behaviour in the 'New Entry' wizard in Apache Directory Studio: As soon as all mandatory attributes are filled the isPageComplete flag is set to true and the 'Finish' button becomes enabled. In that case when navigating through the attributes pressing 'Enter' hits the 'Finish' button, however I want to edit the attribute under the cursor.

Now I found a solution: I added a TraversListener to the TreeViewer's control which sets the doit flag to false.

TreeViewer viewer;
...
viewer.getTree().addTraverseListener( new TraverseListener()
{
    public void keyTraversed( TraverseEvent e )
    {
        if ( e.detail == SWT.TRAVERSE_RETURN )
        {
            e.doit = false;
        }
    }
} );