How to disable adorner border around nodes with some children checked

[James]

I have a treeview with tri-state mode enabled bound to a hierachical data source. When I check some children of a node (but not all), a red adorner border surrounds the whole RadTreeViewItem. A screenshot is attached.

How do I disable this border?

RadTreeView XAML:

<telerik:RadTreeView
            telerik:AnimationManager.IsAnimationEnabled="False"
            Grid.Row="0"
            ItemsSource="{Binding ElementName=ElementRoot, Path=RoleList}"
            SelectedItem="{Binding ElementName=ElementRoot, Path=SelectedRole, Mode=TwoWay}"
            ItemContainerStyle="{StaticResource ApplicationTreeViewStyle}"
            IsOptionElementsEnabled="True"
            ItemsOptionListType="CheckList"
            IsTriStateMode="True"
            DropExpandDelay="00:00:00"
            ScrollViewer.HorizontalScrollBarVisibility="Auto"
            ScrollViewer.VerticalScrollBarVisibility="Auto" />

HierarchicalDataTemplate:

<HierarchicalDataTemplate
    DataType="{x:Type Models:Role}"
    ItemsSource="{Binding Children}">
    <TextBlock
        Text="{Binding DisplayName}" />
</HierarchicalDataTemplate>

RadTreeViewItemStyle:

<Style x:Key="ApplicationTreeViewStyle" TargetType="{x:Type telerik:RadTreeViewItem}">
    <Setter
        Property="IsSelected"
        Value="{Binding Path=Selected, Mode=TwoWay}"/>
    <Setter
        Property="CheckState"
        Value="{Binding Path=Checked, Mode=TwoWay, Converter={StaticResource Bool2ToggleConverter}}"/>
    <Setter
        Property="IsExpanded"
        Value="{Binding Path=Expanded, Mode=TwoWay}" />
</Style>

Thank you,

James

[Petar Mladenov]

Hello James,

 This looks very strange to us. Is it possible for you to isolate it in a sample project that we could investigate locally? You can also check our test project where this is not reproducible, but you can correct us if we are missing something. Please also mention your exact assemblies version that you use. Thank you in advance.

Regards,
Petar Mladenov
the Telerik team