As per the Implicit Styles
article in our documentation, you can find the XAML files in the local installation of the Telerik controls. The folder Themes
contains the different resources for the different themes that you can use in your application. You can have a look at the Template of the GridViewRow
element for the theme that you have set. There is a certain border that is applied to the selected item and respectively you can track down the brush that is applied to this specific state.
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