ArcGIS Pro 2.8 API Reference Guide
IElementContainer Interface
Members 

ArcGIS.Desktop.Layouts Namespace : IElementContainer Interface
Represents a container of elements. The two possible containers are the layout itself or a group element.
Syntax
public interface IElementContainer 
Public Interface IElementContainer 
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

IElementContainer Members
ArcGIS.Desktop.Layouts Namespace