WPF ListBox: Change Item Background color based on condition

Hi,

I would like to know how to make a string color when signalTest:  FAIL display in the grid ListBox should show as red color and PASS as green color and battery with percentage in C# with color, too (see code below):

XAML

<Grid HorizontalAlignment="Stretch" Name="uxGlance" Visibility="Collapsed" Grid.RowSpan="2"> 
    <Grid.RowDefinitions> 
        <RowDefinition Height="40"/> 
        <RowDefinition Height="20"/> 
        <RowDefinition/> 
    </Grid.RowDefinitions> 
    <Label x:Name="uxSensorGlanceTitle" Height="38" FontSize="21.333" VerticalAlignment="Top" Content="At a Glance" FontWeight="Bold" Foreground="#FF325C7F" FontStyle="Italic"/> 
    <Border Height="1" BorderBrush="Black" BorderThickness="0,1,0,0" VerticalAlignment="Top" Margin="0,35,10,0"/> 
    <Grid Grid.Row="1"> 
        <Grid.ColumnDefinitions> 
            <ColumnDefinition Width="55" SharedSizeGroup="A"/> 
            <ColumnDefinition Width="*" SharedSizeGroup="B"/> 
            <ColumnDefinition Width="100" SharedSizeGroup="C"/> 
            <ColumnDefinition Width="*" MinWidth="100" SharedSizeGroup="D"/> 
            <ColumnDefinition Width="125" SharedSizeGroup="E"/> 
            <ColumnDefinition Width="100" SharedSizeGroup="F"/> 
            <ColumnDefinition Width="100" SharedSizeGroup="G"/> 
        </Grid.ColumnDefinitions> 
        <TextBlock Grid.Column="1" Text="Sensor Name" FontSize="16" FontWeight="Bold" /> 
        <TextBlock Grid.Column="2" Text="Version"  HorizontalAlignment="Right" FontSize="16" FontWeight="Bold" /> 
        <TextBlock Grid.Column="3" Text="Data"  Margin="0,0,10,0" HorizontalAlignment="Center" FontSize="16" FontWeight="Bold" /> 
        <TextBlock Grid.Column="4" Text="Last Check In" Margin="0,0,10,0" HorizontalAlignment="Right" FontSize="16" FontWeight="Bold" /> 
        <TextBlock Grid.Column="5" Text="Signal" HorizontalAlignment="Center" FontSize="16" FontWeight="Bold" /> 
        <TextBlock Grid.Column="6" Text="Battery" HorizontalAlignment="Center" FontSize="16" FontWeight="Bold"/> 
    </Grid> 
    <ListBox Grid.Row="2" Name="uxSensorList" ItemsSource="{Binding}" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch" Grid.IsSharedSizeScope="False"> 
        <ListBox.Resources> 
            <DataTemplate DataType="{x:Type business:Sensor}"> 
                <Grid> 
                    <Grid.RowDefinitions> 
                        <RowDefinition Height="*"/> 
                        <RowDefinition Height="1"/> 
                    </Grid.RowDefinitions> 
                    <Grid.ColumnDefinitions> 
                        <ColumnDefinition Width="60" SharedSizeGroup="A"/> 
                        <ColumnDefinition Width="*" SharedSizeGroup="B"/> 
                        <ColumnDefinition Width="100" SharedSizeGroup="C"/> 
                        <ColumnDefinition Width="*" MinWidth="100" SharedSizeGroup="D"/> 
                        <ColumnDefinition Width="125" SharedSizeGroup="E"/> 
                        <ColumnDefinition Width="100" SharedSizeGroup="F"/> 
                        <ColumnDefinition Width="100" SharedSizeGroup="G"/> 
                    </Grid.ColumnDefinitions> 
                   <TextBlock Grid.Column="1" Text="{Binding Path=SensorName}" FontWeight="Bold" VerticalAlignment="Top"> 
                        <LineBreak/> 
                    </TextBlock> 
                    <TextBlock Grid.Column="1" Text="{Binding Path=RadioBand}"  FontWeight="Bold" VerticalAlignment="Bottom"> 
                    </TextBlock> 
                    <Label Grid.Column="2" HorizontalAlignment="Right"  Content="{Binding Path=FirmwareVersion}" VerticalAlignment="Center" /> 
                    <TextBlock Grid.Column="3" Text="{Binding Path=SensorID, Converter={StaticResource LastReading}}"  HorizontalAlignment="Center" VerticalAlignment="Center"/> 
                    <TextBlock Grid.Column="4" Text="{Binding Path=LastCommunicationDate, Converter={StaticResource ToLocalDateTime}}" FontSize="13"  HorizontalAlignment="Left" VerticalAlignment="Center"/>
                    <Label Grid.Column="5"   Content="{Binding Path=SensorID, Converter={StaticResource SignalSTR}}" HorizontalAlignment="Right"  VerticalAlignment="Center"  />                    
                    <Label Grid.Column="6" HorizontalAlignment="Center"  Content="{Binding Path=SensorID, Converter={StaticResource BatteryRead}}" VerticalAlignment="Center"/> 
                    <Rectangle Grid.Row="1" Grid.ColumnSpan="7" Stroke="#FF000000" Height="1" StrokeThickness="1" StrokeDashArray="4 4" SnapsToDevicePixels="True"/> 
                </Grid> 
            </DataTemplate> 
        </ListBox.Resources> 
    </ListBox> 
</Grid>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Windows.Media;
  
namespace MonatDesktop
{
    public class LastReadingConverter : IValueConverter
    {
  
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Sensor sens = Sensor.Load(value.ToLong());
            if (sens == null)
                return "";
  
            DataMessage message = DataMessage.LoadLastBySensorQuick(sens.SensorID, sens.LastDataMessageGUID, sens.LastCommunicationDate);
            if (message != null)
            {
                return message.DisplayData.Replace(",", "\r\n");
                //return message.DisplayData.Replace(",", "\r\n") +  " | Raw :" + message.Data;
            }
            else
                return "";
        }
  
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
  
    public class LastSignalSTR : IValueConverter
    {  
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Sensor sens = Sensor.Load(value.ToLong());
            if (sens == null)
                return "";
  
            DataMessage message = DataMessage.LoadLastBySensorQuick(sens.SensorID, sens.LastDataMessageGUID, sens.LastCommunicationDate);
            if (message != null)
            {                 
                //here Fail and Pass
                int maxRSSI = int.MinValue;
                string signalTest = " FAIL ";
  
                //---  here  string signalTest FAIL in color Red
               
                //signalTest = System.Drawing.Color.Red;
  
                if (string.IsNullOrEmpty(sens.GenerationType) || sens.GenerationType == "Gen1")
                {
                    maxRSSI = -40;
                }
  
                if (sens.GenerationType == "Gen2")
                {
                    if (sens.RadioBand.Contains("433"))
                        maxRSSI = -40;
                    else
                        maxRSSI = -35;
                }
  
                if (maxRSSI <= message.SignalStrength)
                    signalTest = " PASS ";
               //- HERE to make string  signalTest: PASS  display in green color
  
                //Here display PASS or FAIL (-23 / -75 )   and message in orange color 
                return signalTest + "(" + message.SignalStrength.ToString() + "/" + maxRSSI.ToString() + ")";
            }
            else
                return "";
        }
  
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
  
    public class Lastbatterrd : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Sensor sens = Sensor.Load(value.ToLong());
            if (sens == null)
                return "";
  
            DataMessage message = DataMessage.LoadLastBySensorQuick(sens.SensorID, sens.LastDataMessageGUID, sens.LastCommunicationDate);
            if (message != null)
            {
                return message.Battery;
                //-  converting / or making  battery  should  display in percentage with any  color
            }
            else
                return "";
        }
  
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}