ArcGIS Pro 2.6 API Reference Guide
IContentsControl Interface
Members 

ArcGIS.Desktop.Core Namespace : IContentsControl Interface
Implement this interface on the View Model associated with your Contents control to override the default Contents caption or make your control read-only.
Syntax
public interface IContentsControl 
Public Interface IContentsControl 
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

See Also

Reference

IContentsControl Members
ArcGIS.Desktop.Core Namespace