<window id="wd" border="normal" width="100px">
  <tree onClick="wd.doOverlapped();wd.doModal();">
    <treecols>
      <treecol/>
    </treecols>
    <treechildren>
      <treeitem>
        <treerow>
          <treecell label="Click" popup="pp"/>
        </treerow>
      </treeitem>
    </treechildren>
  </tree>
  <popup id="pp">
    <label value="Popup"/>
  </popup>
</window>