Pole beans have reached the top

I recently planted a row of pole beans along a 4' high chain link fence. At the top of the fence I attached strings that reach up to a wire about 7' high. The tallest plants have just reached the top of the string. Should I prune the ends of the beans so that they don't start hanging over, or going horizontal? Or should I just let them go where ever they want to go? Thanks!
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Michael said:

I always let mine flop over and go where they want. Never prune them.
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Pat in Plymouth MI ('someplace.net' is comcast)

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