title: Custom Excel 2013 UI does not appear to be working
body: <p>I have an Add-in created in Excel 2013 that I am attempting to call through a custom ribbon created through Custom UI Editor for Microsoft Office.</p>
  
  <p>I have created the XAML and it is as follows:</p>
  
  <pre><code>  &lt;customUI xmlns="http://schemas.microsoft.com/office/2009/07/customui"&gt;
      &lt;ribbon startFromScratch="false"&gt;
          &lt;tabs&gt;
              &lt;tab id="customTab" label="TestTab"&gt;
                  &lt;group id="customGroup" label="TestGroup"&gt;
                      &lt;button id="scanStart" label="Scan Test" imageMso="HappyFace" size="large" onAction="Yolo_eventhandler" /&gt;
                  &lt;/group&gt;
              &lt;/tab&gt;
          &lt;/tabs&gt;
      &lt;/ribbon&gt;
  &lt;/customUI&gt;
  </code></pre>
  
  <p>within the Add-in I have the following:</p>
  
  <pre><code>Sub Yolo_eventhandler(control As IRibbonControl)
  MsgBox "YOLO"
  End Sub
  </code></pre>
  
  <p>I have checked the add-in is installed, and I have confirmed the add-in is running when excel starts by adding a msgbox in the add-ins "onLoad" event. I can also run macros that I have manually added to the ribbon.
  The error message I am getting is: "Cannot run the macro 'Yolo_eventhandler'. The macro may not be available in this workbook or all macros may be disabled".
  I have checked my trust settings and the folder this add-in is located (the default add-ins folder) is definately trusted.
  Interestingly, when I copy the eventhandler code to a module in an xlsx file I also have open it works perfectly.
  Can anyone suggest how to get this correctly firing from the add-in?</p>