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.ContextMenu 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.).

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.ItemsControl
                        System.Windows.Controls.Primitives.MenuBase
                           System.Windows.Controls.ContextMenu
                              ImageGear.Windows.Controls.ImGearPageViewContextMenu

Reference