ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Desktop.Mapping Namespace / TOCActiveMapViewProviderPane Class / OnHidden Method

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    OnHidden Method (TOCActiveMapViewProviderPane)
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    Called when the pane is hidden
    Syntax
    protected override void OnHidden()
    Protected Overrides Sub 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