Attempting to create a simple ladder rung.  Since unfolding round shapes does not work, we've attempted to generate a flat pattern using a "square bar".  Apparently we're missing something basic here in order to get a complete flat pattern.  The attached file is quite basic and we could use some ideas from the group on how to get a full flat pattern. Tried looking for similar posts or discussions but found none.

Done completely in 2011 SP5.