title: How to open a tool window of a visual studio extension programmatically?
body: <p>So I've got <a href="https://stackoverflow.com/questions/28450237/how-to-add-additional-tool-windows-to-a-visual-studio-extension">two tool windows</a> in my visual studio extension (package) and I'd like to open up the second window via a button on the first window.</p>
  
  <p>I expected this to be explained here: <a href="https://msdn.microsoft.com/en-us/library/vstudio/bb164576(v=vs.100).aspx" rel="nofollow noreferrer">"How to: Open a Tool Window Programmatically"</a>, but it wasn't.</p>