ArcGIS Pro 3.2 API Reference Guide
ArcGIS.Desktop.Framework.Contracts Namespace / DockPane Class / OnHidden Method

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    OnHidden Method (DockPane)
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    Called when the DockPane is completely hidden.
    Syntax
    protected internal virtual void OnHidden()
    Protected Friend Overridable Sub 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