title: Adding a custom button to the advanced find robbon
body: <p>I've got my customizations.xml importing ok, but when I open the Advanced Find Dialog, it tell me "Ribbon XML Validation Error":</p>
  
  <p><img src="https://i.stack.imgur.com/DBj18.png" alt="enter image description here"></p>
  
  <p>I can't seem to get any more info than that.  Below is my customizations.xml text, I've tried to simplify it as much as possible.</p>
  
  <hr>
  
  <pre><code>&lt;ImportExportXml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"&gt;
    &lt;Entities&gt;&lt;/Entities&gt;
    &lt;Roles&gt;&lt;/Roles&gt;
    &lt;Workflows&gt;&lt;/Workflows&gt;
    &lt;FieldSecurityProfiles&gt;&lt;/FieldSecurityProfiles&gt;
    &lt;Templates /&gt;
    &lt;RibbonDiffXml&gt;
      &lt;CustomActions&gt;
        &lt;CustomAction Id="DEW.Mscrm.AdvancedFind.Groups.Debug.UploadFetchXml"
                      Location="Mscrm.AdvancedFind.Groups.Debug._children" &gt;
          &lt;CommandUIDefinition&gt;
            &lt;Button Id="DEW.Mscrm.AdvancedFind.Groups.Debug.UploadFetchXmlButton" /&gt;
          &lt;/CommandUIDefinition&gt;
        &lt;/CustomAction&gt;
      &lt;/CustomActions&gt;
      &lt;Templates&gt;
        &lt;RibbonTemplates Id="Mscrm.Templates"&gt;&lt;/RibbonTemplates&gt;
      &lt;/Templates&gt;
      &lt;CommandDefinitions&gt;
      &lt;/CommandDefinitions&gt;
      &lt;RuleDefinitions&gt;
        &lt;TabDisplayRules /&gt;
        &lt;DisplayRules /&gt;
        &lt;EnableRules /&gt;
      &lt;/RuleDefinitions&gt;
      &lt;LocLabels /&gt;
    &lt;/RibbonDiffXml&gt;
    &lt;EntityMaps /&gt;
    &lt;EntityRelationships /&gt;
    &lt;OrganizationSettings /&gt;
    &lt;optionsets /&gt;
    &lt;Languages&gt;
      &lt;Language&gt;1033&lt;/Language&gt;
    &lt;/Languages&gt;
  &lt;/ImportExportXml&gt;
  </code></pre>