Fill background object, max size

http://www.sekati.com/
If you look at the 2nd balk you see a fill like ///////////////

How am i able to 2 make that.

If i use an attach on a box 100x100.
And use //// every 10px. Put it max Stage.width.

U will see the lines /// every 100px? or more…


Someone with a solution ?