When setting the second TabItem IsSelected property of Tabview, it does not take effect, and the first TabItem is still selected,and the second one alsodisplays the selection style.
Code
<telerik:RadTabView x:Name="tabView" AutomationId="tabView">
<telerik:TabViewItem HeaderText="Home">
<Label Margin="10" Text="This is the content of the Home tab" />
</telerik:TabViewItem>
<telerik:TabViewItem HeaderText="Folder" IsSelected="True">
<Label Margin="10" Text="This is the content of the Folder tab" />
</telerik:TabViewItem>
<telerik:TabViewItem HeaderText="View">
<Label Margin="10" Text="This is the content of the View tab" />
</telerik:TabViewItem>
</telerik:RadTabView>
Please Refer to the attachment for the results.