ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Core Namespace / IContentsProvider Interface / Contents Property

Contents Property (IContentsProvider)
The Contents created by this provider.
Syntax
Contents Contents {get;}
Remarks
The contents will be shown in the Contents Dock Pane when the IContentsProvider (i.e. your Pane) is the active pane
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also