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>

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

        <TextBlock Margin="0,0,5,0">
            <Hyperlink NavigateUri="{Binding Caption}"
                        Foreground="#0C2DAA"
                        Style="{StaticResource linkStyle}"
                        Command="{Binding Path=DataContext.SelectedLinkCommand,
                                RelativeSource={RelativeSource FindAncestor, 
                                AncestorType={ x:Type views:MainWindowView}}}">

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

            </Hyperlink>

        </TextBlock>

    </StackPanel>

</HierarchicalDataTemplate>

<controls:TreeViewEx ItemsSource="{Binding TreeItems}"/>

private TreeItemModel _SelectedTreeLink;
public TreeItemModel SelectedTreeLink
{
    get { return _SelectedTreeLink; }
    set
    {
        if (_SelectedTreeLink != value)
        {
            _SelectedTreeLink = value;
            RaisePropertyChanged("SelectedTreeLink");
        }
    }
}

private ICommand _SelectedLinkCommand;
public ICommand SelectedLinkCommand
{
    get
    {
        if (_SelectedLinkCommand == null)
            _SelectedLinkCommand = new RelayCommand(SelectedLinkExecuted, SelectedLinkCanExecute);

        return _SelectedLinkCommand;
    }
}

private bool SelectedLinkCanExecute()
{
    return true;
}
private void SelectedLinkExecuted()
{
    var item = SelectedTreeLink;
}