Htmbl table navigation problem

Question

We have migrated portal 6.20 to NW04. We have a iVIew where we are displaying material list in htmlb table. But table navigation is not working for the table. Caching mechanizam for 6.2 and NW04 is diffrent so I made changes in portalapp.xml file.
removed the lines referring to the portal version from the portalapp.xml:
  <application-config>
    <property name="ClassLoadingPolicy" value="5.0"/>
    <property name="DeploymentPolicy" value="5.0"/>
    <property name="AuthenticationPolicy" value="5.0"/>
  </application-config>
Also, a line was added in the Portalapp.xml:
    <property name="ALLOW_BROWSER" value="No"/>
Also set the Allow Client-Side Caching = no and Cache Level = none
even in table navigation is,
     public void onNavigateMaterials(Event event) {
                         if (SESSIONEXPIRED)
                              return;
                         request = (IPortalComponentRequest) this.getRequest();
                         mySession = request.getComponentSession();
                         profile = request.getComponentContext().getProfile();
                         res = request.getResourceBundle();
                         Bean_R3_Materials materials =
                              (Bean_R3_Materials) mySession.getValue("R3_Materials");
                         TableNavigationEvent tne = (TableNavigationEvent) event;
                         int newRow;
                         newRow = tne.getFirstVisibleRowAfter();
                         materials.setVisibleFirstRow(newRow);
                         jspOutput = Constants.TAB_MATERIALS;
and bean is as
public Bean_R3_Materials() {
          this.visibleFirstRow = 1;
public int getVisibleFirstRow ()  {
                return visibleFirstRow;
     public void setVisibleFirstRow (int vfr)  {
                this.visibleFirstRow = vfr;
KIndly suggest, what is missing? Points assured.

Answer 1

I have just noticed that the problem page had a error icon in the bottom left corner of IE, when I clicked this the description is 'Can't set focus on the item because it disabled, or of type that does not accept focus...etc'.
I have code that enables/disables the buttons in the header fragment, and when I comment out the call to this in the page init() method, the error is no longer displayed and the table functions as expected.
I will continue to investigate what I have to do to resolve the problem and still provided the necessary functionality.