ArcGIS Pro 2.9 API Reference Guide
ArcGIS.Desktop.Layouts Namespace (ArcGIS.Desktop.Extensions) Inheritance Hierarchy
Inheritance Hierarchy
System.Object
   ArcGIS.Desktop.Framework.Contracts.PropertyChangedBase
      ArcGIS.Desktop.Framework.Contracts.PlugIn
         ArcGIS.Desktop.Framework.Contracts.Button
            ArcGIS.Desktop.Framework.Contracts.Tool
               ArcGIS.Desktop.Layouts.LayoutTool
   ArcGIS.Desktop.Layouts.LayoutExtensions
   System.EventArgs
      System.Windows.RoutedEventArgs
         System.Windows.Input.InputEventArgs
            System.Windows.Input.KeyboardEventArgs
               System.Windows.Input.KeyEventArgs
                  ArcGIS.Desktop.Layouts.LayoutViewKeyEventArgs
            System.Windows.Input.MouseEventArgs
               ArcGIS.Desktop.Layouts.LayoutViewMouseEventArgs
               System.Windows.Input.MouseButtonEventArgs
                  ArcGIS.Desktop.Layouts.LayoutViewMouseButtonEventArgs
See Also

Reference

ArcGIS.Desktop.Extensions Assembly