<?xml version="1.0"?> 
<?xml-stylesheet href="resource:/res/samples/xul.css" type="text/css"?> 

<!DOCTYPE window> 

<window style="height: 100%; width: 100%;" 
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> 

<slider orient="vertical" curpos="50">
   <thumb flex="100%"/>
</slider>

</window>

