HTMLPanel inside DockLayoutPanel does not show up

Hi,

I have a HTMLPanel which wraps several components.
If I enclose this with a DockLayoutPanel and place it into the center, it is not rendered anymore.

<g:DockLayoutPanel unit="PCT">
 <g:center>
  <g:HTMLPanel>
    <g:Button><br/><br/>
    <g:Label>
  </g:HTMLPanel>
 </g:center>
</g:DockLayoutPanel>

Why am I seeing an empty screen for this?

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