jugg: In my current theme ("Polemic") I need to know how many tiles the tasksbar have, because I draw a skinbox - which deal better with alpha transparency - under it. Then, the skinbox have to grow/shrink on tasks tiles add/remove.

Currently, I load both taskbar3 and tasks. But it's not a good idea, I guess...
taskbar3 only bring me:
TaskbarOnAdd !bang
TaskbarOnDel !bang