[Dolibarr-dev] Message information

[Mapluz Dev]

hello
In my module, I wish display a message, the same type of message when, for example, you clone an invoice.
I tried this but nothing is displayed:
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require_once(DOL_DOCUMENT_ROOT."/core/class/html.formfile.class.php");
$form = new Form($this->db);
            $formquestion=array();
            $formconfirm=$form->formconfirm($_SERVER["PHP_SELF"],
                                            "Class do not exist",
                                            "what to do",
                                            'confirm_message',
                                            $formquestion,
                                            'yes',
                                            1);
            print $formconfirm;
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Do you have any idea?
Thanks

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