title: How to controling an existing MDI child from an external form
body: <p>MainWindow is the MDI parent. WebPage is the MDI child.  PageTitle is the external form</p>
  
  <p><a href="http://i.stack.imgur.com/PD2mL.png" rel="nofollow">http://i.stack.imgur.com/PD2mL.png</a></p>
  
  <p>I would like to use the PageTitle form to control the active WebPage MDI form (Active MDI child).</p>