title: Eclipse RCP toolbar separators dont show up
body: <p>I'm having a problem with the main toolbar in my Eclipse RCP application. The added separators in my plugin.xml never show up. Their visibility are all set to <strong>true</strong></p>
  
  <p>Is this a known bug? Because programatically added separators in some views contributions show up just fine.</p>
  
  <p>See attached pic:</p>
  
  <p><img src="https://i.stack.imgur.com/RtpLN.png" alt="enter image description here"></p>
  
  <p>Here is the plugin.xml part:</p>
  
  
  
  <pre><code>&lt;menuContribution
          locationURI="toolbar:org.eclipse.ui.main.toolbar"&gt;
       &lt;toolbar
             id="hu.clickandlike.wfbpmn.application.toolbar1"&gt;
          &lt;command
                commandId="hu.clickandlike.wfbpmn.application.menu.command.new"
                icon="icons/1390594879_document-new.png"
                label="New"
                style="push"&gt;
             &lt;visibleWhen
                   checkEnabled="false"&gt;
                &lt;with
                      variable="hu.clickandlike.wfbpmn.application.menu.command.new.state"&gt;
                   &lt;equals
                         value="true"&gt;
                   &lt;/equals&gt;
                &lt;/with&gt;
             &lt;/visibleWhen&gt;
          &lt;/command&gt;
          &lt;command
                commandId="hu.clickandlike.wfbpmn.application.menu.command.open"
                icon="icons/1390594932_document-open.png"
                label="Open"
                style="push"&gt;
             &lt;visibleWhen
                   checkEnabled="false"&gt;
                &lt;with
                      variable="hu.clickandlike.wfbpmn.application.menu.command.open.state"&gt;
                   &lt;equals
                         value="true"&gt;
                   &lt;/equals&gt;
                &lt;/with&gt;
             &lt;/visibleWhen&gt;
          &lt;/command&gt;
          &lt;separator
                name="Separator 1"
                visible="true"&gt;
          &lt;/separator&gt;
          ...
  </code></pre>