Found the following question here:
Hello, I am using flexigrid in my application. There is a problem with the Horizontal resize that I cannot reduce the width less than that initial width that I give to it while making the grid.
You can also see this problem in the "Example 3" on http://flexigrid.info/. Try reducing the width of the grid.
I was having the same problem using flexigrid 1.1 and I found a solution so I thought I would post it.
If anyone has a better solution that does not require editing the plugin let me know.