Hi Jason,
I did some testing and found that if the you turn on Allow Edit? in Step 5 of 9 of your Grid Wizard then you will get the blue bars as in your screenshot. If you turn Allow Edit? off and check the Auto Grow? button you should get the results you are looking for. Let me know if this works for you.
At this time I'm not sure of how to get the Auto Grow? feature to behave the same way if Allow Edit? is on but I will check back to this post if I can find a solution.
- Jason