Collapsable area... inside another collapsable area?

[PntSingularity]

Been trying to do this with <tbody> using vB's standard collapse thingie.

I've got a db with info I'm fetching, and would like it in multiple collapsable areas. However, as soon as I'm adding collapse-code for the child data it starts acting weird and won't show the children at all.

Storage Box
ID    DATA
1      Example1
2      Example2
     ->Child1
     ->Child2
3      Example3
     ->Child1
4      Example4

Collapsed it looks like:

Storage Box

...and I want the children to be able to collapse too:

Storage Box
ID    DATA
1      Example1
2      Example2
3      Example3
4      Example4

EDIT:
Btw, I need to be able to collapse the whole thing, so removing that part isn't an option.