Thank you for contacting us.
"What I want is the letter "J" of January to go right above its tick and so for the letter "R" of December.
This scenario is not supported out of the box and to achieve it you will need to use a template selector for the ticks. You will also have to give the first and last tick margins so that they align as you wish. I've prepared a small project demonstrating this functionality. Have a look at it and let me know if something is unclear.
I would also like to give the selected tick more visibility when selected. So I was wondering if it is possible to highlight or to maximize the tick when selected.
This scenario is not yet supported. I've logged your request in our PITS
and we will definitely consider it when implementing new features for RadSlider. The log item is called "Slider: Notification when reaching a tick" and it will be available for tracking tomorrow the latest.
Let us know if you have additional questions or comments on the topic.
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