Can we remove a Block (West, East, North or South block) of a DockLayoutPanel?

I like DockLayoutPanel cos it's quite solid. However, there's a big problem.

That ishow can i  remove a Block (West, East, North or South block) of a DockLayoutPanel?

Let say, i got this code

          <g:DockLayoutPanel ui:field="centralDockLayoutPanel">

        <g:center>

      <g:LayoutPanel ui:field="mainPanel"/>  

</g:center>

    <g:east size="200">

        <g:HTMLPanel ui:field="happyHTMLPanel"  width="100%" height="100%"> 

     Some more widgets here

   </g:HTMLPanel> 

    </g:east>

      </g:DockLayoutPanel>  

I want to remove the East block out of the centralDockLayoutPanel. So i tried

getView().getCentralDockLayoutPanel().setWidgetSize(getView().getHappyHTMLPanel(),1);

But that doesn't work

getView().getHappyHTMLPanel().setVisible(false); also doesn't work

Can we remove a Block (West, East, North or South block) of a DockLayoutPanel?

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