Q:

Window preview is not working in DockbarX

I have installed dockbarx using an article at omgubuntu. http://www.omgubuntu.co.uk/2010/12/new-look-dockbarx-hits-ppa/. The problem is that the window preview feature is not working. 
UPDATE: While running dockbarx_factory.py run-in-window , i get the following warning:
 ** (dockbarx_factory.py:3820): WARNING **: Trying to register gtype 'WnckWindowState' as enum when in fact it is of type 'GFlags'

** (dockbarx_factory.py:3820): WARNING **: Trying to register gtype 'WnckWindowActions' as enum when in fact it is of type 'GFlags'

** (dockbarx_factory.py:3820): WARNING **: Trying to register gtype 'WnckWindowMoveResizeMask' as enum when in fact it is of type 'GFlags'
Dockbarx init
Dockbarx reload
Opened window matched with gio app on id: empathy
Opened window matched with gio app on id: gnome-terminal

.

How can i enable the preview?. 

A:

To use the window previews,you need CompizConfig Settings Manager
sudo apt-get install compizconfig-settings-manager

Warning: What are some of the issues with CCSM and why would I want to avoid it?

Also in gnome enable KDE Compatibility plugin  System>>Preferences>>CompizConfig Settings Manager.

Once you enable this plugin, in DockBarX preferences goto Applications>>Accessories>>DockBarX>> Preference), on the Window List tab, enable Show Previews.

