listbox elements

Hello,

I´m rather new in XUL and I have a small question about the examples in 
the XUL-Tutorial. When I´m trying to run the examples for "tabboxes" and 
so on, everything runs fine.

But the examples about the tags "description" and "listbox" (what is 
very important for me) don´t run at all. No output is shown. Even in my 
own applications with this tags no output is shown. I´ve also tried it 
on another pc with absolutely the same result.

This is the source that doesn´t work:
<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window id="example-window" title="Example 2.5.1"
        xmlns:html="http://www.w3.org/1999/xhtml"
        
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<listbox>
  <listitem label="Butter Pecan"/>
  <listitem label="Chocolate Chip"/>
  <listitem label="Raspberry Ripple"/>
  <listitem label="Squash Swirl"/>
</listbox>
</window>

Maybe one of you can help me, that would be very nice. I´m looking 
forward for any answer.

bye
Martin Kessler


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