Draw a rectangle to group 3 bars

[Winnie]

Is it possible to write a program to draw a rectangle groping the highest high and lowest low for every 3 bars in the chart ?

Thanks

[NinjaTrader_Bertrand]

Yes Wnnie, you can use DrawRectangle for that - http://www.ninjatrader-support.com/H...Rectangle.html

Also you want to use a unique draw object tag id then so you see the history.