Customizing OpenSolaris Screen Resolution running in VirtualBox

1. Install VirtualBox on your MacBook Pro.
   
   
2. Install OpenSolaris in the new VirtualBox instance.
   
   
3. Start up OpenSolaris.
   
   
4. From the VirtualBox VM application (the one OpenSolaris is running in), choose Devices->Install Guest Additions.
   
   This will mount the vboxadditions_2.0.2_36486 disk image on your OpenSolaris system.
   
   
5. Become root in OpenSolaris (You can open a terminal window by choosing Applications->System Tools->Terminal).
   
   # su root
   
   
6. Change directory to the disk image.
   
   # cd /cdrom/vboxadditions_2.0.2_36486
   
   
7. Install the Solaris VirtualBox addition.
   
   # pkgadd -d ./vboxadditions_2.0.2_36486
   
   This package installation creates the /etc/X11/xorg.conf file.
   
   
8. (Optional) In the /etc/Xll/xorg.conf file, add the new screen resolution to the Modes field in the default ViewPort section (I added the 1440x900 entry).
   
   ViewPort      0  0
              Depth               24
              Modes           "1440x900_60.00" "1024x768_75.00" "800x600_75_00" "640x480_60.00"
   
   NOTE: After some more testing, it looks like you don't need to do this step unless you want to be able to select a specific resolution from the Screen Resolution Preferences window.  Once you install the Solaris VirtualBox Addition, all you need to do is expand the VirtualBox window and the OpenSolaris desktop expands as well.  I swear this didn't work the first time I tried this, which is why I had this problem in the first place. That's a few hours I'll never get back...
   
   
9. Reboot OpenSolaris.
   
   
10. After OpenSolaris reboots, change the screen resolution by choosing System->Preferences->Screen Resolution.
    
    You'll see the new resolution that you added...at least I did.  Everything has been working so far.
    
    
11. Be happy that you now have a larger area to enjoy OpenSolaris!