Facebook like button in first post

[ROTPAR]

To get it on the first port, I tried this:
http://www.vbulletin.com/forum/forum...b-like-button?

but placing the likebutton code in there, shows just nothing

--------------- Added [DATE]1362670983[/DATE] at [TIME]1362670983[/TIME] ---------------

the problem seems to be this code:

<vb:if condition="$show['fb_likebutton']">
{vb:raw fblikebutton}
</vb:if>

This code does not work in postbit_legacy....how could I get it to work there?