title: how to set caption for calculated measure in MDX
body: <p>i have a MDX query in Mondrian like below </p>
  
  <pre><code>with member [Measures].[a] as '([Measures].[LCount] * 2)'
   member [Measures].[b] as '([Measures].[a] * 3)'
  select {[Rate].[Rate].Members} ON COLUMNS,
  {[Measures].[a], [Measures].[b]} ON ROWS
  from [c];
  </code></pre>
  
  <p>and i want to set caption for my calculated measures that is different with their uniqeName
  what should i do? </p>
  
  <p>NOTICE :</p>
  
  <pre><code>with member [Measures].[a] as '([Measures].[LCount] * 2)',
  CAPTION = "my measure"
  </code></pre>
  
  <p>doesn't work!</p>