High and Low on Renko returning incorrect values

I am using Renko charts, the built-it Renko does not show wicks, when I fetch the high or low I get the valuer displayed on the chart, even though there might have been a higher or lower value in that interval, so it seems not only that the wicks are not displayed but they are not considered when fetching the high or low. 

To overcome that I downloaded a Renko chart with wicks, so now wicks are being displayed but if I fetch the high or low it's still returnign the open or close, so the wicks are ignored.

How do I get the correct high and low?

I use Bars.HighPrices to get the High and LowPrices to get the Low.