[ic] tree tag: Keep first level visible

[interchange-users@interchange.redhat.com (Kaare Rasmussen)]

I'd like to always keep the first level visible with the tree tag. How do I 
do that?

With first level I mean the level immediately below TOP:

TOP--1
         1
         1--2
             2
             2--3
             2

I'd like to prohibit the user to close level 1.

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