Delphi gone mad: Says TstringList.sorted is an "undeclared identifier"

My code is exactly like the example in the he开发者_开发百科lp file:

myStrings := TStringList.Create;
myStrings.Sorted := True;
myStrings.Duplicates := dupIgnore;

The compiler tells me that both sorted and Duplicates are undeclared identifiers.

But, how can that be if it correctly reconizes the TStringList.Create? I have not redifined stringList classes any where else. It is a simple testing stub that has the absolute minimum components in order to test a specific tecnique... uses Classes, Windows and Dialogs --in that order.

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I think that myString is declared as TStrings

var myStrings: TStrings; //From second Comment

Declare that as TStringList

var myStrings: TStringList;