WPF

<Window.Resources>

    <Style x:Key ="linkStyle"
           TargetType="{x:Type Hyperlink}" >
        <Style.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
                <Setter Property="TextBlock.TextDecorations" Value="Underline"/>
                <Setter Property="Foreground" Value="RoyalBlue" />
            </Trigger>
            <Trigger Property="IsMouseOver" Value="False">
                <Setter Property="TextBlock.TextDecorations" Value="{x:Null}"/>
                <Setter Property="Foreground" Value="RoyalBlue" />
            </Trigger>
        </Style.Triggers>
    </Style>

    <HierarchicalDataTemplate DataType="{x:Type models:NodeModel}"
                          ItemsSource="{Binding Path=Children}">
        <StackPanel Orientation="Horizontal"
                Margin="2">

            <TextBlock>

                <Hyperlink NavigateUri="{Binding Caption}"
                           Foreground="#0C2DAA"
                           Style="{StaticResource linkStyle}"
                           CommandParameter="{Binding}"
                           Command="{Binding Path=DataContext.SelectedLinkCommand,
                                    RelativeSource={RelativeSource FindAncestor,
                                    AncestorType={ x:Type views:MainWindowView}}}">

                    <InlineUIContainer>
                        <TextBlock Text="{Binding Caption}" />
                    </InlineUIContainer>

                </Hyperlink>

            </TextBlock>

        </StackPanel>

    </HierarchicalDataTemplate>

</Window.Resources>

<Grid>

    <controls:TreeViewEx ItemsSource="{Binding TreeData}"
                         SelectedItemEx="{Binding SelectedTreeItem, Mode=TwoWay}"
                         Grid.Row="0"
                         Grid.Column="0">

        <TreeView.Resources>
            <!--Make the selected item's background transparent-->
            <SolidColorBrush Color="Transparent" x:Key="{x:Static SystemColors.HighlightBrushKey}"/>
        </TreeView.Resources>

        <TreeView.ItemContainerStyle>
            <Style TargetType="{x:Type TreeViewItem}">
                <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
            </Style>
        </TreeView.ItemContainerStyle>

    </controls:TreeViewEx>

</Grid>

<TreeView.Resources>
    <!--Make the selected item's background transparent-->
    <SolidColorBrush Color="Transparent" x:Key="{x:Static SystemColors.HighlightBrushKey}"/>
</TreeView.Resources>

<TreeView.ItemContainerStyle>
    <Style TargetType="{x:Type TreeViewItem}">
        <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
    </Style>
</TreeView.ItemContainerStyle>