$(document).ready(function(){
    console.log("BBCode_init();")
    var element = document.getElementById("outils_message_reponse");
    var BBCodeContainer = document.createElement('div');
    BBCodeContainer.className = "btn-group groupe-boutons-barre-outils";
    var BBCodeButton = document.createElement('button');
    BBCodeButton.className = "btn btn-reduit";
    BBCodeButton.type = "button";
    BBCodeButton.onclick = ajouterBBCode('message_reponse', '[test]', '[/test]', 6);
    BBCodeButton.title = "Test Button";
    BBCodeContainer.appendChild(BBCodeButton);
    console.log(BBCodeContainer);
});

// Generated HTML (Missing onclick attribute)
<div class="btn-group groupe-boutons-barre-outils"><button class="btn btn-reduit" type="button" title="Test Button"></button></div>