Where does the list of "Available Applications" come from? How can items/categories be added/deleted?
On LXPanel - "Add/Remove Panel Items":
Panel Preferences
====================================
|Panel Applets|
---------------
|Currently loaded plugins|
--------------------------
[Application Launch Bar] <Edit>
Application Launch Bar
==============================================================
|Applications| <Add> |Available Applications|
. <Remove> .
. <Up> .
. <Down> .
. .
I am using lubuntu 11.10, LXPanel 0.5.8.