CSS DropShadow for DockLayoutPanel?

Hi,
I'm trying to apply a dropshadow around a DockLayoutPanel area. But can't get it to work:

    .shadow {
        -moz-box-shadow: 3px 3px 4px #000;
        -webkit-box-shadow: 3px 3px 4px #000;
        box-shadow: 3px 3px 4px #000;
        /* For IE 8 */
        -ms-filter: "progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000')";
        /* For IE 5.5 - 7 */
        filter: progid:DXImageTransform.Microsoft.Shadow(Strength=4, Direction=135, Color='#000000');
    }


<g:DockLayoutPanel unit='EM' styleName='{style.shadow}'>
<g:center...>
<g:east...>


Result: NO drop shadow at all. What might be wrong here?

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