UIBinder & Loading Panel

[JB70]

Hi, This is another newbie question. I have set up a left navigation
panel and would like to know how to display a panel when a link is
clicked? I want to display the FormPanel when a validation link is
clicked on the left panel.Thanks for your answers.

<!DOCTYPE ui:UiBinder SYSTEM "http://dl.google.com/gwt/DTD/xhtml.ent";>
<ui:UiBinder xmlns:ui="urn:ui:com.google.gwt.uibinder"
        xmlns:g="urn:import:com.google.gwt.user.client.ui">

  <ui:image field='logo' src='logo.gif'/>

  <ui:style>
  .statusDiv {
    text-align: right;
    margin: 1em;
  }

  .linksDiv {
    text-align: left;
  }

  @if user.agent ie6 {
    .logo {
      background-image: url(logo_ie6.gif);
      width: 140px;
      height: 75px;
      position: absolute;
    }
  } @else {
    @sprite .logo {
      gwt-image: 'logo';
      position: absolute;
    }
  }
  </ui:style>

  <g:HTMLPanel>
    <div class="{style.statusDiv}">
      <div class='{style.linksDiv}'>
        <g:Anchor href='javascript:;'
ui:field='memberValidation'>Member Validation</g:Anchor>
        <g:Anchor href='javascript:;' ui:field='enrollMember'>Enroll
Member</g:Anchor>
      </div>
    </div>
  </g:HTMLPanel>
</ui:UiBinder>

<ui:UiBinder
  xmlns:ui='urn:ui:com.google.gwt.uibinder'
  xmlns:g='urn:import:com.google.gwt.user.client.ui'
  xmlns:main='urn:import:com.poc.client'>

  <g:DockLayoutPanel unit='EM'>
    <g:north size='5'>
      <main:TopPanel ui:field='topPanel' />
    </g:north>

    <g:center>
      <g:DockLayoutPanel>
        <g:west size='150'>
          <main:LeftPanel ui:field='leftPanel' />
        </g:west>

        <g:center>
          <main:FormPanel ui:field='formPanel' />
        </g:center>
      </g:DockLayoutPanel>
    </g:center>
  </g:DockLayoutPanel>

</ui:UiBinder>

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