For a description of this member, see IList.IndexOf.
The Object to locate in the FreezableCollection<T>.
This member is an explicit interface member implementation. It can be used only when the FreezableCollection<T> instance is cast to an IList interface.
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.