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Function parameter with "set of.." type should be registered as "set".

Example:

 

  HtScriptGlobal.RegisterFunc('MessageDlg(Msg: string; DlgType: integer; 

    Buttons: Set; HelpCtx: integer): Integer', @MessageDlg);

 

Calling in script:

 

  MessageDlg('Test', mtWarning,  [mbYes, mbNo, mbCancel], 0);