ArcGIS Pro 3.1 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TOCActiveMapViewProviderPane Class / OnActivate Method
True if this pane is being made the active pane, otherwise false
Version

    OnActivate Method (TOCActiveMapViewProviderPane)
    Called when the pane is activated (receives focus - active is true) or deactivated (loses focus - active is false).
    Syntax
    protected override void OnActivate( 
       bool active
    )

    Parameters

    active
    True if this pane is being made the active pane, otherwise false
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3.0 or higher.
    See Also