The only way that this would be possible is to extract and edit the default ControlTemplate of the RadSlider control. You can find more information on how to do that in this help article
. When you edit the default ControlTemplate you will be able to host a control that will visualize the histogram. As far as I can see in the referenced picture our RadColumnSparkline
may be the control that you need to visualize the histogram.
Please try to integrate both controls and let us know if you encounter any issues.
Pavel R. Pavlov
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