Thanks alan_sh, that was able to get me to play around and get what I wanted.
It appears, and this may sound newbie, that I had to use a footer to get the full height of the textbox to stay length of the gridlay using, as you mentioned, the flexgrid. I had previously used the flex container which could not get the achieved full height for the textbox.
The primary reason I was needing this was to keep a consistent even height for adjacent textboxes (3each) that I needed the colored backgrounds to stay the same height.
If you take the linked file you kindly gave me and color the textboxes background color in each column, you will see hat I was trying to explain. One textbox background will be uneven in height, not giving a good look when adjacent (side by side). So this really helped me.. Thanks alot!
mhz