Using NT 7, I wrote code that successfully calculates the number of trades that happen at the bid and ask. I was able to draw a rectangle round the "point of control" (i.e., the price level where the greatest number of trades took place. However, when a new range bar is drawn, the rectangle on the previous bar disappears.

I would like to know the best way to keep the POC rectange on each bar as new bars are drawn.

Any help would be appreciated.

You may get more responses if you included the code you wrote.
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bulldog 

Using NT 7, I wrote code that successfully calculates the number of trades that happen at the bid and ask. I was able to draw a rectangle round the "point of control" (i.e., the price level where the greatest number of trades took place. However, when a new range bar is drawn, the rectangle on the previous bar disappears. I would like to know the best way to keep the POC rectange on each bar as new bars are drawn. Any help would be appreciated.