Nested Panel Grid

Hi,
I have a page contains panelgroup -> panelgrid -> 4panelgrid.
First Row X1Y1,X2Y1 and second row X2Y1,X2Y2.
X1Y1 column size is equal to X2Y1,X2Y2.I want to align the same way i.e
X1Y1 X2Y1
X2Y2
X1Y2
I tried css style vertical align:top also tried in columnclass.
But I unable to align proper way.We used Microsoft filter dropshadow in the style class.
Please let me know how to resolve this problem.
Thanks

I didn't used table probs(our apps standards).Please see the sample code.
<h:panelGroup id="groupId" >
     <h:panelGrid columns="2" align="center" id="gridId" >
          <h:panelGrid columns="1" cellpadding="2" cellspacing="0">
          </h:panelGrid >
          <h:panelGrid columns="2" cellpadding="2" cellspacing="0"
               style="vertical-align: top; filter:progid:DXImageTransform.Microsoft.dropshadow(sprobs)">
          </h:panelGrid >
          <h:panelGrid columns="2" cellpadding="2" cellspacing="0"
               style="vertical-align: top; filter:progid:DXImageTransform.Microsoft.dropshadow(sprobs)">
          </h:panelGrid>
          <h:panelGrid columns="3" cellpadding="2" cellspacing="0" >
          </h:panelGrid>
     </h:panelGrid>
<h:panelGroup>

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Hi,
I'm having the exact same problem, and it's freaking me out!!! The setGridPanel method is always called but not the getGridPanel. This one is only called the first time the page is rendered, and when I change a drodpdownlist it never gets the gridPanel again! I'm using an HtmlPanelGrid. Anyone can help please?
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Thanks for your answer !
So far, it is better : I have overriden the paintComponent method insteda of the paint method and the background image shows up. But the "close" button on the nested (centrered) panel doesn't work any longer. I can click on it, but it stays grayed and the panel doesn't hide. I read the articles you pointed out but couldn't find much for this (except opacity, which I experimented without success).
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    private javax.swing.JButton jButton2;
    private javax.swing.JPanel jPanel1;
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