- jqn.find('ul').outerHeight(); //buttons' height

<script><![CDATA[
zk.afterLoad('zkmax.inp', function () {
    zk.override(zkmax.inp.Tbeditor.prototype, {}, {
        _calcEditorHeight: function (height) {
        var jqn = jq(this.$n());
        var tbBox = jqn.children().eq(0);
        var btnPaneSclass = this.$s('button-pane');
        if (!tbBox) return null;

        return zk.parseInt(height) - zk.parseInt(tbBox.css('marginTop'))
                                - zk.parseInt(tbBox.css('marginBottom'))
                                - 2 * zk.parseInt(tbBox.css('border'))
                                - jqn.find('.' + btnPaneSclass).outerHeight(); //buttons' height
        }
    });
});
]]></script>