site.xml

<?xml version="1.0" encoding="UTF-8"?>
<site>
    <attributes>
        <attribute>quiqqer.blocks.areas</attribute>
    </attributes>

    <!-- extend every panel -->
    <window>
        <tab name="quiqqer.blocks">
            <text>
                <locale group="quiqqer/blocks" var="site.panel.blocks.category.title" />
            </text>
            <image>icon-th</image>
            <onload require="package/quiqqer/blocks/bin/Site/Category"></onload>
        </tab>
    </window>

</site>