Assembly imports
<p>I have this code:</p>

<pre><code>  private void WheelResize(object sender, MouseWheelEventArgs e)
</code></pre>

<p>The compiler gives me this error:</p>

<pre><code> The type or namespace name 'MouseWheelEventArgs' could not be found (are you missing a using directive or an assembly reference?)
</code></pre>

<p>The problem is that it works fine with <code>MouseButtonEventArgs</code>, which is apparently in the same assembly and namespace. What gives?</p>
