<?xml version="1.0"?>
<!DOCTYPE window>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
        title="XUL Grid Test">
  <hbox>
    <vbox style="background:aqua">
      <label value="Left" />
    </vbox>
    <vbox style="background:yellow">
      <textbox value="Right" />
    </vbox>
  </hbox>
</window>