public class PreviewControl : UserControl, 
	IDisposable

Public Class PreviewControl _
	Inherits UserControl _
	Implements IDisposable

public ref class PreviewControl : public UserControl, 
	IDisposable

The dialog or form or window host this preview control must be modal. The view can be any graphical view but not a non-graphical view. And only one can be active. The view can be manipulated by embedded view cube and the visibility and graphical settings set on the view will be evident in the preview control.

System..::..Object
  System.Windows.Threading..::..DispatcherObject
    System.Windows..::..DependencyObject
      System.Windows.Media..::..Visual
        System.Windows..::..UIElement
          System.Windows..::..FrameworkElement
            System.Windows.Controls..::..Control
              System.Windows.Controls..::..ContentControl
                System.Windows.Controls..::..UserControl
                  Autodesk.Revit.UI..::..PreviewControl