Typica/config/Windows/success.xml

<window id="success">
    <layout type="vertical">
        <label>Success</label>
        <button type="push" id="ok" name="Okay" />
    </layout>
    <program>
        var button = findChildObject(this, 'ok');
        button.clicked.connect(this.close);
    </program>
</window>