title: Auto sizing column in TVirtualStringTree
body: <p>Climbing the learning mountain of TVirtualTreeView, I'm attempting to create a custom descendant that ensures that, when the control is resized, the width of the last column exactly fills control's width without requiring a horizontal scroll bar.</p>
  
  <p>I see a number of items (a method and a number of events) pertaining to "AutoFitColumns", but not documentation covering this feature.  Can I use AutoFitColumns to automatically resize my last column and if so, how.</p>