ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / PopupCommand Class / Command Property

Command Property
Internal command used for binding in the pop-up window.
Syntax
public ICommand Command {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also