<TextBlock TextWrapping="Wrap">
                                    
    <TextBlock TextWrapping="Wrap"
                Text="{Binding Path=Text}" />
                                    
    <TextBlock TextWrapping="Wrap"
                Margin="4,0,0,0"
                Text="{Binding Path=Question}" 
                Visibility="{Binding Path=Question, Converter={StaticResource StringToColapseConv}}" />
                                    
    <TextBlock TextWrapping="NoWrap"
                Margin="4,0,0,0"
                Visibility="{Binding Path=Question, Converter={StaticResource StringToColapseConv}}">
        <Hyperlink Click="YesHyperLinkButton_Click">
            <TextBlock Text="Yes" />
        </Hyperlink>
        <TextBlock Text=" / " />
        <Hyperlink Click="NoHyperLinkButton_Click">
            <TextBlock Text="No" />
        </Hyperlink>
    </TextBlock>
</TextBlock>

    public class StringToColapseConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string input = (string)value;

            if (input == null) return Visibility.Collapsed;
            if (input == "") return Visibility.Collapsed;

            return Visibility.Visible;
        }
    }