This property can be used to retrieve any TabItem object in the collection.
The TabItem object returned can be of type Tab or TabSeparator. Each language in .Net has its own method of determining the type of an object, for example, the keyword is can be used in C#.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2