How To Change The Color Of The RadToggleSwitchButton Thumb
|Product||RadButtons for WPF|
To achieve this requirement, you can extract the ControlTemplate of RadToggleSwitchButton. Then find the Border with x:Name="PART_Thumb" in the template and set its Background property or customize it in your way. Also, note that the exact customization in the template may vary from theme to theme. More information about how to extract the default template of the control can be found in the Editing Control Templates help article.