WPF

<Setter Property="TextBlock.FontWeight" Value="Bold"/>

Triggers collection members must be of type EventTrigger.

<ListBox Grid.Row="1"
            Grid.Column="0"
            Width="225"
            ItemsSource="{Binding TOC}"
            BorderBrush="SlateBlue"
            BorderThickness=".5"
            Padding="10"
            IsEnabled="False">
            
    <ListBox.Resources>
        <DataTemplate DataType="{x:Type models:TOCModel}">
            <StackPanel Orientation="Horizontal"
                        Margin="2">
                <TextBlock Text="{Binding Caption}">
                </TextBlock>
            </StackPanel>
        </DataTemplate>
    </ListBox.Resources>
            
</ListBox>

<Style TargetType="{x:Type ListBox}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type ListBox}">
                <Grid Width="Auto" 
                        Height="Auto">
                    <Border x:Name="Border"
                            BorderBrush="SlateBlue"
                            BorderThickness=".5"/>
                    <ScrollViewer Focusable="false" 
                                    IsTabStop="False" 
                                    Margin="8"
                                    HorizontalScrollBarVisibility="Disabled">
                        <StackPanel IsItemsHost="true"/>
                    </ScrollViewer>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="false">
                        <Setter Property="Background" Value="White"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Setter Property="Background" Value="White"/>
</Style>            

public class TOCModel
{
    public string Caption { get; set; }
    public bool IsCurrentItem { get; set; }
}

<Style TargetType="{x:Type ListBoxItem}">
  <Setter Property="FontWeight" Value="Normal" />
  <Style.Triggers>
    <DataTrigger Binding="{Binding IsCurrentItem}" Value="True">
      <Setter Property="FontWeight" Value="Bold" />
    </DataTrigger>
  </Style.Triggers>
</Style>

If (!load)
{
  //IDataErrorInfo Validation code
}

private readonly XNamespace _xamlNS  = @"http://schemas.microsoft.com/winfx/2006/xaml/presentation";
private readonly XNamespace _sysNS   = @"clr-namespace:System;assembly=mscorlib";
private readonly XNamespace _xNS     = @"http://schemas.microsoft.com/winfx/2006/xaml";
private readonly XNamespace _localNS = @"clr-namespace:System;assembly=WpfConsoleApp";

//--------------------------------------------------------------------------------
public void ImagesFromText2(string folder)
{
    foreach (DynamicContentItem item in ContentItems)
    {
        if (item.ContentType == "text")
        {
            XElement container = new XElement("Canvas",
                            new XAttribute("xmlns", _xamlNS),
                            new XAttribute("xmlns:x", _xNS),
                            new XAttribute("xmlns:local", _localNS),
                            new XAttribute("Padding", "0,0,0,0"),
                            new XAttribute("Width", item.CanvasElement.Width.ToString()),
                            new XAttribute("Height", item.CanvasElement.Height.ToString()));

            XElement child = item.CanvasElement.AsXElement;
            string xaml = child.ToString();

            child.Name = @"{http://clearchannel.com/spotchart/WpfConsoleApp}SpotChartTextBlock";
            //xElement.RemoveAttribute("Background");
            //xElement.RemoveAttribute("Panel.ZIndex");
            //xElement.RemoveAttribute("Canvas.Right");
            //xElement.RemoveAttribute("Canvas.Bottom");
            //xElement.RemoveAttribute("Canvas.Left");
            //xElement.RemoveAttribute("Canvas.Top");
            child.SetAttributeValue("Margin", "0,0,0,0");
            child.SetAttributeValue("xmlns", _xamlNS);
            child.SetAttributeValue("xmlns:x", _xNS);
            child.SetAttributeValue("xmlns:local", _localNS);

            string text = item.LocalData;
            if (item.CanvasElement.IsDateTime)
            {
                child.SetAttributeValue("Text", item.LocalDataFormatted);
            }
            child.Name = @"{http://clearchannel.com/spotchart/WpfConsoleApp}SpotChartTextBlock.RenderTransform";
            container.Add(child);

            xaml = container.ToString();
            Canvas canvas = (Canvas)(XamlReader.Parse(xaml));

            SpotChartTextBlock textBlock    = (SpotChartTextBlock)(canvas.Children[0]);
            textBlock.VerticalTextAlignment = item.VerticalAlign;
            textBlock.SizeToFit             = item.SizeToFit;
            textBlock.MinimumFontSize       = item.MinimumFontSize;
            textBlock.Process();
            int width = (int)textBlock.Width;
            int height = (int)textBlock.Height;

            RenderTargetBitmap rtb = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);
            DrawingVisual dv = new DrawingVisual();
            using (DrawingContext ctx = dv.RenderOpen())
            {
                VisualBrush vb = new VisualBrush(canvas);
                ctx.DrawRectangle(vb, null, new Rect(new Point(), new Size(width, height)));
            }
            rtb.Render(dv);
            PngBitmapEncoder png = new PngBitmapEncoder();
            png.Frames.Add(BitmapFrame.Create(rtb));
            MemoryStream stream = new MemoryStream();
            png.Save(stream);
            System.Drawing.Image image = System.Drawing.Image.FromStream(stream);
            image.Save(System.IO.Path.Combine(folder, string.Format("{0}.png", item.ElementName)));
        }
    }
}