ArcGIS Pro 2.8 API Reference Guide
OnExpanded Method (Item)

ArcGIS.Desktop.Core Namespace > Item Class : OnExpanded Method
Override to implement any custom logic when your item is expanded
Syntax
public virtual Task OnExpanded()
Public Overridable Function OnExpanded() As Task
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

Item Class
Item Members