Changed keyboard navigation method for VScrollTable to protected so one could implement a totally own keyboard navigation logic for the Table by extending the VScrollTable.

svn changeset:13080/svn branch:6.4

src/com/vaadin/terminal/gwt/client/ui/VScrollTable.java

      * @param event
      *            The keyboard event received
      */
-    private boolean handleNavigation(int keycode, boolean ctrl, boolean shift) {
+    protected boolean handleNavigation(int keycode, boolean ctrl, boolean shift) {
         if (keycode == KeyCodes.KEY_TAB) {
             // Do not handle tab key
             return false;