Run my Ubuntu in VirtualBox back then before 3.0, I can enable the normal graphics effects, like menu fading, and others. When I upgraded to 3.0, it breaks everything, even the basic menu fading also not working, it stuck in half transparency and stays until I click on something else.
The VirtualBox 3.1.2 update dialog bugging me every time I open my VirtualBox interface, and today I finally installed. Run the VBoxLinuxAdditions-x86.run to update the client addition, and the Display option shows extra option, which is enable the 2D acceleration, I enabled both 2D and 3D, and now it works like a charm, I can even do full graphic effects in my Ubuntu 9.10 box. Yay!