Listing 3. Plain XUL Code for a <tree> Widget with
Static Content

<?xml version="1.0"?>
<?xml-stylesheet
  href="chrome://global/skin/global.css"
  type="text/css"?>
<!DOCTYPE window>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
  title="Process Tree">

<tree id="t1" flex="1">
  <treecols>
    <treecol flex="1" id="A"
      label="primary column" primary="true"/>
    <treecol flex="1" id="B" label="column 2"/>
    <treecol flex="1" id="B" label="column 3"/>
  </treecols>

  <treechildren id="titems" flex="1">

    <treeitem id="row1" container="true"
     open="true">
      <treerow>
        <treecell label="Cell"/>
        <treecell label="Cell"/>
        <treecell label="Cell"/>
      </treerow>

      <treechildren>
        <treeitem>
          <treerow>
            <treecell label="Cell"/>
            <treecell label="Cell"/>
            <treecell label="Cell"/>
          </treerow>
        </treeitem>
      </treechildren>
    </treeitem>

    <treeitem>
      <treerow>
        <treecell label="Cell"/>
        <treecell label="Cell"/>
        <treecell label="Cell"/>
      </treerow>
    </treeitem>

 </treechildren>
</tree>

</window>