XF 2.1 Conditionals Per Thread

[thenashy]

I've had a look at some of the resources on here, but I can't work it out. Is it possible to use a conditional to show a widget only on a single thread?

 

[Anomandaris]

<xf:if is="$thread.thread_id == 0">
    Show content...
</xf:if>

change 0 to thread id.