how do i control the HorizontalPanel's location in VerticalPanel

  I Have had  tried three way to control it ,

  First way：  use VerticalPanel.setheight and HorizontalPanel.setVerticalAlignment to do it , but HorizontalPanel.setVerticalAlignment do nothing
  Second way ：only use  HorizontalPanel.setVerticalAlignment , the HorizontalPanel is always on top . but I wanna set VerticalPanel's height

  third way ：use css to control it .   i have two stylename testPanelStyle{height: 200px;} and  testPanelStyle .gwt-HorizontalPanel{vertical-align: top;} to do it . but it's nothing

  now   I put a HorizontalPanel in VerticalPanel,  want the HorizontalPanel's location to be the top in  VerticalPanel and set the VerticalPanel height 

  who can teach me how i do it? , thx.

                                                                                                                        

  

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