ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TOCMapPaneProviderPane Class / OnHidden Method
Version

OnHidden Method (TOCMapPaneProviderPane)
Notification letting the Pane know it has been hidden.
Syntax
protected override void OnHidden()
Remarks
3rd party panes cannot be hidden. They are always closed
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also