title: InvokeCommand arguments with ReactiveUI 7
body: <p>I'm switching to the latest version of ReactiveUI (7.0) and I'm running into some incompatibilities and would like to know the suggested way to handle this:</p>
  
  <p>ReactiveUI 6.x</p>
  
  <pre><code>Texts.Events().MouseUp
       .InvokeCommand(ViewModel, x =&gt; x.DoSomething);
  </code></pre>
  
  <p>This now throws an exception:</p>
  
  <blockquote>
    <p>Command requires parameters of type System.Reactive.Unit, but received parameter of type System.Windows.Input.MouseButtonEventArgs.</p>
  </blockquote>
  
  <p>I fixed this by using the following code, but is this the right way?</p>
  
  <pre><code>Texts.Events().MouseUp
       .Select(x =&gt; Unit.Default)
       .InvokeCommand(ViewModel, x =&gt; x.DoSomething);
  </code></pre>