How to draw a veritcal lines at the start of every hour?

Hi, I have this indicator.
It draws vertical lines at the start of each hour, but it can not refresh itself to draw new lines when a new hour comes.
It only draws the past.
I wonder if you guys can help me to recode this indicator so that it can draw vertical lines at **:00 each hour from the past to the future.
We can use it in M1 timeframe, very useful.
Thank you all!

Have read of this thread here:-

http://www.forexfactory.com/showthread.php?t=236296

Theres an indy called Grid that'll do it...

Wow, that's it.
Thank you so much!