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

ID Property (PopupCommand)
Internal id used to uniquely identify the command.
Syntax
public string ID {get;}
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also