I'd use the Box-Whisker series, just have a look at the demo that I mentioned above. You can configure every detail of the series, e.g. remove the "Whisker" by setting the WhiskerWidth to zero. The only problem is that a common color is used throughout the series. In order to change color between increasing and decreasing price I'd use two series: the first one in green for the increasing price, and the other one in red for the decreasing price. When you add a data point to the chart you only have to decide whether the price is increasing or decreasing in order to add it to the correct series.