Stay in fullscreen mode after lid-close?

Hi,

when I close the lid on my MacBook while parallels is in fullscreen mode and then open it again
parallels will have returned to windowed mode.

Is there any way to avoid that?
Or at least any special reason why it does that?

 

This is already fixed in latest beta - http://www.parallels.com/en/products/desktop/update_beta/ .