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MessageDlg produces an error when is inside an application datamodule


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I try to put the following code  


MessageDlg( 'Cannot Delete record' , mtWarning, [mbOK]);


in a Application DataModule but code does not build and I get the error 'Undeclared identifier MessageDlg'


If I place the same code in a TUniFrame there is no such error 



I would be grateful if someone can give me a clue of what I done wrong.



Thank you very much

Nick Lazidis

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