..ah, let me restate that.
This ui.xml makes the tab panel layout in the center of the dock panel disappear: <g:DockLayoutPanel unit='EM'> <g:north size='5'> <g:HTML><div>north</div></g:HTML> </g:north> <g:east size='2'> <g:HTML><div>east</div></g:HTML> </g:east> <g:south size='2'> <g:HTML><div>south</div></g:HTML> </g:south> <g:west size='12'> <g:HTML><div>west</div></g:HTML> </g:west> <g:center size='2'> <g:HorizontalPanel> <g:TabLayoutPanel ui:field="tabLayoutPanel" barHeight="28"> <g:tab><g:header>This</g:header> <g:HTML> Lorem ipsum dolor sit amet, consectetur adipiscing elit. </g:HTML> </g:tab> <g:tab><g:header>That</g:header> <g:HTML> In consequat, odio non tincidunt ornare, metus diam cursus odio, eget venenatis nulla sapien non massa. </g:HTML> </g:tab> <g:tab><g:header>The Other</g:header><g:HTML>the other</g:HTML></g:tab> </g:TabLayoutPanel> </g:HorizontalPanel> </g:center> </g:DockLayoutPanel> The same goes for VerticalPanel. But, if I switch to a FlowPanel wrapping the TabLayoutPanel, the tabs appear but the content under the tabs does not. sfm -- http://groups.google.com/group/Google-Web-Toolkit-Contributors