How to vertical align an element inside a customCell of a Grid in UiBinder in GWT?

I have this Grid in UiBinder:

<g:Grid >     <g:row>         <g:customCell addStyleNames="{style.alignTop}">              <g:HTMLPanel> some widget here</g:HTMLPanel>          </g:customCell>      </g:row>  </g:Grid>  

In CSS file

.alignTop{      vertical-align: top;  }  

However, after ran, nothing happened, the HTMLTable still in the default position (in the middle of the cell).

So, How to make the HTMLTable inside the customCell of a Grid to have VerticalAlign=TOP?

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