title: Set OpenFileDialog to default to Thumbnail view
body: <p>I'm using the OpenFileDialog class so a user can select an image file.  I'd like to default the dialog to Thumbnail view mode.  Unfortunately the class doesn't have any way to set a default view mode.</p>
  
  <p>Other than creating my own custom dialog (which I may have to do), is there a way to achieve my goal?</p>