Your questions was already answered in the Support thread started by you (Ticket ID: 486662). To avoid duplicate threads I suggest that we keep our further conversation on this in one of the threads by your choice. I'm copying my answer here:
We are known of such unwanted behavior which is experienced when the Chart is in a DataTemplate. It is logged in our PITS system here
. If this is the case I suggest that you try wrapping your chart inside a UserControl and using this UserControl inside the DataTemplate.
Also you may try to use the Selection
property (of type SelectionRange<double>) of the the RadSlider, instead of SelectionStart and SelectionEnd.
If you are still facing this unwanted behavior we would like to ask if you could provide us a runnable stripped down version of your project. We will inspect it locally and get back to you with our findings/suggestions based on the code.
All the best,
the Telerik team
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