title: ControlFormat.Enabled property throwing error
body: <p>I want to lock a dynamic drop down in VBA, but face an issue while trying to set the <code>Dropdown.ControlFormat.Enabled</code> property. </p>
  
  <pre><code>ddlIsNegative.TopLeftCell.Locked = True
  Set lbcf = ddlIsNegative.ControlFormat
  If (lbcf.value = 2) Then
      ddlIsNegative.ControlFormat.Enabled = False
  End If
  </code></pre>
  
  <p>While setting <code>ddlIsNegative.ControlFormat.Enabled</code> property, it throws the error</p>
  
  <blockquote>
    <p>unable to set enabled property of Group Object class</p>
  </blockquote>