Create Disk Selector in the Web UI

Hey Everyone,

I am pretty new to the Plugin Development in Unraid and PHP in general. Currently I am trying to write a Disk Selector comparable to the Include/Exclude Disks in the Share Creation.

What I have so far:

DisplaySettings.page

_(utilization indicator disks)_:
: <select id="s1" name="usage_disks" multiple="multiple" style="display:none">
  <?foreach ($disks as $disk):?>
  <?=mk_option_check(_var($var,'usage_disks'),_var($disk,'name'),_var($disk,'name'))?>
  <?endforeach;?>
  </select>

Within the Page I can see that the selector gets correctly generated.

But unlike the Share Creation Page, I am unable to create the span with the actual Selector Box. I can't find any hint within the Share Page where it is generated.

Note: I am using mk_option_check on purpose, I don't want to limit it to diskN. The limitation to the correct disks will follow at a later point.

Thank you very much in Advance!