ToolBar.IsOverflowItem Attached Property
Gets a value that indicates whether the ToolBar item is an overflow item.
Assembly: PresentationFramework (in PresentationFramework.dll)
This property is a read-only attached property. Read-only attached properties are uncommon, and have no direct XAML usage. However, you can use the attached property reference as a property trigger in a style, to apply different style values to an item within a toolbar that is in the overflow panel.
Metadata properties set to true