Windows preview working only for open windows

[luvshines]

I enabled the windows preview effect from CCSM but it seems to be working only for the open windows.
For the windows that I have minimized, no preview is shown when I hover over them in taskbar

Is this an expected behaviour ??
Can I change it to be shown for all sorts of windows irrespective of open/closed states ??

[~Aquatic]

It has always been like this in Compiz. But the next version (0.9.2) will actually be showing minimized windows too.'

More Info (http://smspillaz.wordpress.com/2010/09/12/compiz-showcase-whats-coming-up-in-0-9-2/)