title: ReactiveUI Command chain
body: <p>I do need to execute one command after another, thing I'm trying to do:</p>
  
  <pre><code>FirstCommnand.Select(_ =&gt; Unit.Default).InvokeCommand(SecondCommand);
  </code></pre>
  
  <p>But neither <code>Select</code>, nor <code>InvokeCommand</code> called. </p>
  
  <p>What am I missing?</p>