Adds the specified UIElement to the InternalChildren collection of a VirtualizingPanel element at the specified index position.
The index position within the collection at which the child element is inserted.
The UIElement child to add to the collection.
This method offers better performance for Panel elements that virtualize their child collection than does the Add method.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.