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To make the resizable scrollbar transparent you can extract and edit the default template of the control. Basically, after you have extracted the template you can navigate to a RadSlider
control with x:Name="PART_Slider"
and set its Background
property to Transparent
. We have an Editing Control Templates
help article in our documentation where you can find more information how you can edit the default template of the controls.
Give this approach a try and let us know if it works for you.
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