3차메뉴가 있을 경우에 3차메뉴가 출력되도록 하고 싶습니다.

<div class="submenu">
<button type="button">
<block loop="$main_menu->list => $key1, $val1" cond="$val1['selected']">
<block loop="$val1['list'] => $key2, $val2" cond="$val2['selected']">
<block loop="$val2['list'] => $key3, $val3" cond="$val3['selected']">{$val3['link']}</block>
</block>
</block>
</button>
<div>
<!--@foreach($main_menu->list as $key1 => $val1)-->
<!--@if($val1['selected'])-->
<!--@foreach($val1['list'] as $key2 => $val2)-->
<!--@if($val2['selected'])-->
<ul>
<!--@foreach($val2['list'] as $key3 => $val3)-->
<li class="<!--@if($val3['selected'])-->active<!--@end-->">
<a href="{$val3['href']}">{$val3['text']}</a>
</li>
<!--@end-->
</ul>
<!--@end-->
<!--@end-->
<!--@end-->
<!--@end-->
</div>
</div>