Hello Ruben,
You can edit the Style of RadSlider and set a tooltip that is bound to the Value property:
I've attached a project containing a sample solution to this scenario. Have a look at it and let me know if it helps. One further clarification, since the XAML of RadSlider is quite large, you can delete the unnecessary stuff. For example, if your slider is horizontal with just 1 thumb, you can remove HorizontalRangeTemplate, VerticalTemplate etc.
Kind regards,
Kiril Stanoev
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Explore the
Telerik Public Issue Tracking
system and vote to affect the priority of the items