How to format all gridlines within a container?

[cindy]

I have a 4 x 5 container. I need all rows and columns within the container to have a 2px gray line. I was able to format the outer border of the container, but I cannot find a way to format the inner gridlines. Is there a way to show the inner gridlines of a container?

[Rob]

So as a workaround was able to dock horizontal and vertical lines to make internal lines.