Unfortunately I misled you with my first post, please excuse me for that.
The only possible solution to apply custom style to RadSlider attached to additional Y axis is to walk the visual tree, find the panel where the additional vertical axes are and apply the needed style to their sliders. Here is the code for that:
sender, EventArgs e)
var axisContainer =
.Where(container => container.Name ==
You need a flag to make sure it is not done on each layout.
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