title: Parameter into commandhandler
body: <p>I've inherited some code that implements WPF Commands as follows:</p>
  
  <pre><code>    public ICommand pvToggleSelectMapCommand
      {
          get
          {
              return new CommandHandler(() =&gt; pvToggleSelectMap(), true);
          }
      }
  </code></pre>
  
  <p>This is fine without parameters and doesn't use a generic RelayCommand-like class to set up the command handling. I need to put a parameter into this now, and am struggling to find a simple way to handle on using this way of command handling.</p>
  
  <p>Any suggestions?</p>