contents of listboxes, bugged?

[Mirarkitty]

I think we're supposed to be able to alter the contents of listboxes, like the mail listbox:

<PanelFile ID="ID_UISkin_Mail_MainField">
  <Element ID="Mail_MainField" X="275" Y="116" Width="472" Height="274"> 
    <Element ID="Mail_Panel" X="0" Y="18" Width="468" Height="254"> 
      <Element ID="Mail_Panel_ListBox" X="13" Y="24" Width="435" Height="195"> 
        <Element ID="MailElement_Letter" X="47" Y="76" Width="435" Height="45"> 
          <Element ID="MailElement_Letter_Admin" X="0" Y="0" Width="435" Height="45"> </Element>
          <Element ID="MailElement_Letter_Main" X="0" Y="0" Width="435" Height="45"> 
            <Element ID="MailElement_Letter_COD" X="385" Y="22" Width="18" Height="18"> </Element>
            <Element ID="MailElement_Letter_Sender" X="24" Y="3" Width="230" Height="20"> </Element>
            <Element ID="MailElement_Letter_Subject" X="24" Y="21" Width="362" Height="20"> </Element>
            <Element ID="MailElement_Letter_TimeLeft" X="244" Y="4" Width="180" Height="19"> </Element>
            <Element ID="MailElement_Letter_ReadStatus" X="5" Y="15" Width="18" Height="18"> </Element>
            <Element ID="MailElement_Letter_Item_Attached" X="405" Y="20" Width="20" Height="20"> </Element>
            <Element ID="MailElement_Letter_Currency_Attached" X="385" Y="22" Width="18" Height="18"> </Element>
          </Element>
        </Element>

...

but in this example, no changes to the content Elements (marked with yellow) gives any changes to the layout. It seems like the old layout was done using templates,

<PanelFile ID="ID_UISkin_VendorItemDisplay_Template">
  <Element ID="VendorItemDisplay_Template" X="60" Y="220" Width="183" Height="64">
    <Element ID="VendorItemDisplay_Item" X="8" Y="7" Width="32" Height="32"></Element>
    <Element ID="ItemDisplay_Name" X="42" Y="8" Width="131" Height="30"></Element>
    <Element ID="VendorItemDisplay_Money" X="17" Y="41" Width="160" Height="22"></Element>
  </Element>
</PanelFile>

but using this variant doesn't give any changes either. Is this bugged (I'm saying bugged because it looks like it's meant to be able to be changed) or am I missing anything here?