Why scrollPanel.ensureVisible does not work if The scrollPanel is the parent panel of many other inside panels (GWT)?

Ok, I got a ScrollPanel in UiBinder & it is the parent panel of many other inside panels.

Ui.xml

<g:ScrollPanel ui:field="productScrollPanel">     <g:HTMLPanel>         <g:DisclosurePanel>             <g:header>Select Word?</g:header>             <g:HTMLPanel>                 <g:FlowPanel>                     <g:Label />... lot of Label here.....                     <g:Label ui:field="showMeLabel" />...... <g:Label/>                 </g:FLowPanel>              </g:HTMLPanel>         </g:DisclosurePanel>      </g:HTMLPanel>  </g:ScrollPanel>  

Then in Presenter

getView().getProductScrollPanel().ensureVisible(getView().getShowMeLabel()); // this doesn't work  

I tried to put another ScrollPanel outside the Label & inside the DisclosurePanel , & set evsureVisible for that scrollPanel but the ScrollPanel doesn't appear.

So how to fix it?

also see question here http://stackoverflow.com/questions/22641082/why-scrollpanel-ensurevisible-does-not-work-if-the-scrollpanel-is-the-parent-pan

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