Probably an easy answer, but yeah... When creating a listener, you have the option of checking a box that says "show start/stop toggle button"...
Uhm...
What happens to this button? Where is it?
<abs contexttype="opengear" gridsize="20" id="_top">
<meta>
<listener autostart="false" buttontype="toggle" listenport="9876" maxlength="1024" name="listener1" udp="true"/>
</meta>
</abs>