By default a PageViewContextMenu with default menu items is shown when right clicking on the PageView control. The default menu items may change from version to version.

The PageView.PageViewContextMenu property can be set to an instance of PageViewContextMenu to specify a custom context menu. This class can be used to specify menu items that are always displayed (ImageGear.Windows.Controls.PageViewContextMenu.Items), menu items that are displayed when right clicking on a page (PageItems), menu items that are displayed when right clicking on any annotation (ImageGear.Windows.Controls.PageViewContextMenu.MarkItems.Common), and menu items that are displayed when right clicking on specific types of annotations (ImageGear.Windows.Controls.PageViewContextMenu.MarkItems.Line, ImageGear.Windows.Controls.PageViewContextMenu.MarkItems.Rectangle, etc.).

If the IsEnabled property is set to false, the default Silverlight context menu will display instead of the PageView context menu.

System.Object
   System.Windows.DependencyObject
      System.Windows.UIElement
         System.Windows.FrameworkElement
            System.Windows.Controls.Control
               System.Windows.Controls.ItemsControl
                  ImageGear.Windows.Controls.ImGearPageViewContextMenu

Reference