Chart Object - Add Lines

Hi Awesome Peoples!

I'd like to see a script that adds lines to a sub chart on a chart.

the subchart can be found under Insert > Objects > Graphical > Chart

programatically draw two lines on that at any price levels that are visible and you've done it!

I really want an example of that. 

thanks,

Simon

PS I recommend giving it a go, prove you can do it for yourself, before applying please.