ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TOCMapPaneProviderPane Class / Secondary Property
Version

    Secondary Property (TOCMapPaneProviderPane)
    Gets the secondary flag value. Returns true if the pane can be positioned as a secondary pane "under" a Map View.
    Syntax
    public override bool Secondary {get;}
    Remarks
    Use DockUnderMapView instead
    Requirements

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also