title: Eclipse plugin project explorer context menu
body: <p>This is part of plugin.xml working context menu for PackageExplorer now I wanted it for ProjecExplorer, so I tried rewrite it to ProjectExplorer but It doesn't work .. I searched the web and found that are problem with that, but I couldn't find working solution. Does anybony experience how to fix do it?</p>
  
  <pre><code>    &lt;extension point="org.eclipse.ui.menus"&gt;
      &lt;menuContribution locationURI="popup:org.eclipse.jdt.ui.PackageExplorer"&gt;
        &lt;command commandId="app.LoadXml"
          label="Load plan" style="push" mnemonic="L"&gt;
           &lt;visibleWhen&gt;
                  &lt;with variable="activeMenuSelection"&gt;
                      &lt;iterate ifEmpty="false"&gt;
                          &lt;adapt type="org.eclipse.core.resources.IResource"&gt;
                                  &lt;test property="org.eclipse.core.resources.name" value="*.xml" /&gt;
                          &lt;/adapt&gt;
                      &lt;/iterate&gt;
                  &lt;/with&gt;
           &lt;/visibleWhen&gt;
        &lt;/command&gt;
      &lt;/menuContribution&gt;
    &lt;/extension&gt;
  </code></pre>
  
  <p>My not working solution - renamed PackageExploer to ProjectExplorer => now context menu. </p>
  
  <pre><code>&lt;extension point="org.eclipse.ui.menus"&gt;
      &lt;menuContribution locationURI="popup:org.eclipse.jdt.ui.ProjectExplorer"&gt;
        &lt;command commandId="app.LoadXml"
          label="Load plan" style="push" mnemonic="L"&gt;
           &lt;visibleWhen&gt;
                  &lt;with variable="activeMenuSelection"&gt;
                      &lt;iterate ifEmpty="false"&gt;
                          &lt;adapt type="org.eclipse.core.resources.IResource"&gt;
                                  &lt;test property="org.eclipse.core.resources.name" value="*.xml" /&gt;
                          &lt;/adapt&gt;
                      &lt;/iterate&gt;
                  &lt;/with&gt;
           &lt;/visibleWhen&gt;
        &lt;/command&gt;
      &lt;/menuContribution&gt;
    &lt;/extension&gt;
  </code></pre>