title: Excel VBA: Confirmation on Pressing CommandButton
body: <p>Upon pressing my CommandButton, I would like to have a pop-up that asks "These changes cannot be undone. It is advised to save a copy before proceeding. Do you wish to proceed?"</p>
  
  <p>And I want to have three options:</p>
  
  <ol>
  <li>Yes - pop-up window is closed and CommandButton Macro is executed</li>
  <li>No - This closes the pop-up window and changes nothing</li>
  <li>Save - closes pop-up window and opens "Save As" (macro is not executed)</li>
  </ol>
  
  <p>I don't really know where to start with this. Could you please give me a hand?</p>
  
  <p>Thank you very much indeed.</p>