missing introduce and initialize from constructor parameter

QuickFix menu on constructor parameter is missing "introduce and initialize" option.  Only show "check parameter for null" and "create overload w/o parameter"

Using:
ReSharper Build 5.1.3000.12 on 2011-01-28T04:05:56
Visual Studio 2010 Professional Version 10.0.40219.1 SP1Rel
Microsoft .NET Framework Version 4.0.30319 SP1Rel
Microsoft Visual C# 2010   01018-532-2002181-70799