FormRegionEvents_Event.Expanded event

Occurs when the form region expands or collapses

Namespace:  Microsoft.Office.Interop.Outlook
Assembly:  Microsoft.Office.Interop.Outlook (in Microsoft.Office.Interop.Outlook.dll)

event FormRegionEvents_ExpandedEventHandler Expanded

This event cannot be cancelled.

Outlook always first loads a form region in an expanded state and sets IsExpanded to True. If the initial state of the form region is to be collapsed, then Outlook immediately closes the form region, fires the Expanded event with the Expand parameter being False, and sets IsExpanded to False.