ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Desktop.Framework.Contracts Namespace / DockPane Class / OnHidden Method
Version

OnHidden Method (DockPane)
Called when the DockPane is completely hidden.
Syntax
protected internal virtual void OnHidden()
Remarks
DockPanes are singletons and pushing their Close button really just hides them.
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also