title: Powershell 2: Unable to suppress warning message
body: <p>I am making a cmdlet call to 'set-distributiongroup' in powershell 2. I am simply setting the value of the parameter 'hiddenFromAddressListsEnabled' to a pre-defined boolean value.</p>
  
  <p>However, no matter what I try, it displays a warning message if the boolean assignment is not actually changing the current value of 'hiddenFromAddressListsEnabled'.</p>
  
  <p>Here is the main command I'm invoking:</p>
  
  <pre><code>set-DistributionGroup -identity TestGroup                  `
                        -hiddenFromAddressListsEnabled=$true
  </code></pre>
  
  <p>Let's semantically define what I have above as 'command'.</p>
  
  <p>Now, I've tried adding several different variants, all with proper line-continuation and syntax. Here are those variants:</p>
  
  <pre><code>command &gt; $null
  command 2&gt; $null
  command -ErrorAction:silentlycontinue
  command -ErrorVariable $throwAway
  command -WarningAction:silentlycontinue
  command -WarningVariable $throwAway
  $var = command
  </code></pre>
  
  <p>Regardless of various combinations of one or more of the above, I still get a yellow WARNING: message spit to output. Specifically, this:</p>
  
  <pre><code>WARNING: The command completed successfully but no settings of
  '&lt;xxxxxx&gt;/Users/TestGroup' have been modified.
  </code></pre>
  
  <p>Any suggestions on a key concept I'm not understanding? I want the command to not produce this output, and I want it to silently continue if this occurs.</p>
  
  <p>Thanks!!</p>