ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TOCActiveMapViewProviderPane Class / OnHidden Method

OnHidden Method (TOCActiveMapViewProviderPane)
Called when the pane is hidden
Syntax
protected override void OnHidden()
Remarks
3rd party panes cannot be hidden. They are always closed
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 2.0 or higher.
See Also