title: Excel Add-In: How to show a windows form as MdiChild of Excel Application
body: <p>I have a windows form [myForm] within a VSTO addin project - currently when I .Show() this form it is displayed outside the Excel application (on another monitor in my case), but I would like it to be displayed as an MdiChild of the Excel application hosting it, so within the main Excel application window.</p>
  
  <pre><code>myForm x = new myForm;
  x.Show();
  </code></pre>
  
  <p>There is an overload of Show() that accepts an owner argument of type  System.Windows.Forms.IWin32Window, but I'm not sure if that is how one might do this?</p>
  
  <p>There is also an MdiParent property of the form, which is of type System.Windows.Forms.Form type, but in this case I want the parent to be the Excel application, not another windows form.</p>