how can I create blocks pn7 style?

Hi,
looks like BL works a little bit different than the postnuke way of
creating new blocks on the site. (surprise, surprise *heh) Reading
through the BL specs left me a little bit clueless. I have one left
block, one right block, one center, standard procedure ;-)
The difference though is, when activating more than two blocks on one
side, with the Xaraya Classic code - copy&paste usually works for me -
puts the login block and poll block into the same html wrap/block
strucure. What code do I have to write that it works pn style, so
adding a new block creates an individual block _with_ the wrap around
it? I think it has something to do with the blockgroup tag, but even in
that case I have to change the code every time I want to add a new
block, right?
1001 thx

Tomi