Control. Form Region Showing
Occurs after an instance of the form region is created but before the form region appears.
public event EventHandler FormRegionShowing;
To get the Outlook item in which the form region appears, call the OutlookItem property.
To get the Inspector that displays the Outlook item, call the OutlookFormRegion to get an instance of the Microsoft.Office.Interop.Outlook._FormRegion, and then call the Inspector property of the Microsoft.Office.Interop.Outlook._FormRegion object.