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You can also create buttons in this way and set its ids:

                $('#dialog').dialog({
                        // properties ... 
                        buttons: [{
                                id:"btn-accept",
                                text: "Accept",
                                click: function() {
                                        $(this).dialog("close");
                                }
                        },{
                                id:"btn-cancel",
                                text: "Cancel",
                                click: function() {
                                        $(this).dialog("close");
                                }
                        }]
                });