Workaround:
this.radListControl1.VisualItemFormatting += RadListControl1_VisualItemFormatting;

 private void RadListControl1_VisualItemFormatting(object sender, Telerik.WinControls.UI.VisualItemFormattingEventArgs args)
 {
     DescriptionTextListVisualItem item = args.VisualItem as DescriptionTextListVisualItem;
     if (item == null)
     {
         return;
     }

     item.MainContent.EnableBorderHighlight = false;
     item.MainContent.EnableHighlight = false;
     item.DescriptionContent.EnableBorderHighlight = false;
     item.DescriptionContent.EnableHighlight = false;

     foreach (var c in item.Children)
     {
         this.SetNMouseProperties(c);
     }           
 }

 private void SetNMouseProperties(RadElement element)
 {
     element.ShouldHandleMouseInput = false;
     foreach (var item in element.Children)
     {
         this.SetNMouseProperties(item);
     }
 }