HorizontalSplitPanel - left side has zero width

Hi,

I would like to use a HorizontalSplitPanel with UIBinder (see below).

The left side of the HorizontalSplitPanel has a zero width and I also cannot change this by dragging the vertical split bar.

I have set the SplitPosition to "150px" and I also made sure that there is some content in the left panel.

Within GWT Designer, when opening the preview, it also opens with a zero left side at the first time. But when opening it again, it shows a non-zero width.

Where is the problem?

Thanks
Magnus

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  <g:DockLayoutPanel unit="PX" width="100%" height="100%">

    

     <g:center>

    <g:HorizontalSplitPanel splitPosition="150px" width="" height="">

    

    <g:DockLayoutPanel unit="PX" width="100%" height="100%">

    

     <g:north size="30">

      <g:FlowPanel>

      <g:ListBox width="" ui:field="lst_Category"/>

      </g:FlowPanel>

     </g:north>

     

     <g:south size="25">

      <g:HorizontalPanel width="100%" height="100%" verticalAlignment="ALIGN_MIDDLE">

       <g:Cell width="20px">

        <g:PushButton text="+" width="16px"/>

       </g:Cell>

        <g:PushButton text="-" width="16px"/>

      </g:HorizontalPanel>

     </g:south>

     

     <g:center>

      <p1:CellList ui:field="cellList"/>

     </g:center>

    </g:DockLayoutPanel>

    <g:DockLayoutPanel unit="PX" width="100%" height="100%">

    

     <g:south size="25">

      <g:HorizontalPanel width="100%" height="100%" verticalAlignment="ALIGN_MIDDLE">

       <g:Cell width="20px">

        <g:PushButton text="+" width="16px"/>

       </g:Cell>

        <g:PushButton text="-" width="16px"/>

      </g:HorizontalPanel>

     </g:south>

     

     <g:center>

    <g:TabLayoutPanel barHeight="2" barUnit="EM" width="100%" height="100%" ui:field="tab"/>

     </g:center>

    </g:DockLayoutPanel>

    

    </g:HorizontalSplitPanel>

     </g:center>

  </g:DockLayoutPanel>

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