My friend, first of all thanks for caring about my posts.
Let me make it clear:
Instead of using layer groups, I used SmartObjects (what a mistake when I think about it).
It's a website design project. Anyway I groupped, in those smart objects, for example, the menu block of the page which includes the menu's graphics and also some "sample" menu text -> as regular text layers.
I know how to edit a smartobject with Photoshop's user interface, but don't know how to do this inside a script (I use JavaScript by the way..).
When I "export" the PSD file to Fireworks in order to slice & export to HTML, I need to get rid of a few text layer. Why? Because let's say I want some picture, who has text on it, to be shown on the web but I want the text as an HTML text. So I need to hide the text layer in the PSD.
.. Try to "flow-read" what I wrote, I hope it's clear