title: Check if a CommandBarButton exists
body: <p>I'm using the following in the <em>ThisOutlookSession</em> of my VbaProject.OTM file to add 2 custom buttons to the new mail's <em>Standard</em> toolbar:</p>
  
  <pre class="lang-vb prettyprint-override"><code>Dim outl As Object
  Dim msg As Object
  Set outl = CreateObject("Outlook.Application")
  Set msg = outl.CreateItem(0)
  msg.Display (False)
  
  Dim objBar As Office.CommandBar
  Dim objButton As Office.CommandBarButton
  
  Set objBar = Application.ActiveWindow.CommandBars("Standard")
  Set objButton = objBar.Controls.Add(msoControlButton)
  
  With objButton
      .caption = "button1"
      .OnAction = "macro1"
      .TooltipText = "Description"
      .faceId = 487
      .Style = msoButtonIconAndCaption
      .BeginGroup = True
  End With
  
  Set objButton = objBar.Controls.Add(msoControlButton)
  
  With objButton
      .caption = "button2"
      .OnAction = "macro2"
      .TooltipText = "Description"
      .faceId = 2525
      .Style = msoButtonIconAndCaption
      .BeginGroup = True
  End With
  
  msg.Close 1
  </code></pre>
  
  <p>The problem is that the buttons will be added every time Outlook starts (which is needed for the other computers I'm willing to deploy my OTM file to). Is there any way to check before adding the buttons if it already exists?</p>