I'm using Visio 2003 Professional. What I want to do is create a database
diagram showing individual rows and the relationships between them. In other
words, something like a standard Database Model Diagram (with foreign key
relationships connecting different tables, etc), but showing a specific
example of those relationships between individual rows instead of entire
tables.

Now, I've seen plenty of documentation about connecting Visio shapes to an
actual, live database, but that's not what I want to do. I just want to
manually create a simple grid-like shape to represent a single table row, and
then connect it to another table row with an arrow. That's all.

Is there some way to do this? I've tried using the built-in Grid stencil for
this, but it's extremely annoying to use (columns don't resize uniformly,
lots of empty space, no connection points, etc). Is there some shape I can
use to represent a single database table row?