Powershell WPF style template for disabled ListBox - wpf

Question

I have a powershell script which at some point creates a WPF form for some basic input from the user.
I have a ListBox with CheckBoxes where user selects necessary options, but it is disabled by default, and user needs to do some actions before it enables. As you can see from below XAML, the overall design is dark, so default disabled styling for ListBox looks pretty ugly. How do I need to change below XAML, so that when disabled, I can control at least the background? I know that I need to create a style template and add trigger that switches styles when ListBox is disabled, but I tried several approaches found online and none of them work.
Here's the XAML I'm using
<Window x:Name="MyLittleFormMainWindow" x:Class="MyLittleForm.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:MyLittleForm"
mc:Ignorable="d"
Title="My Little Form" Height="450" Width="800" FontFamily="OCRB" FontSize="14" Opacity="0.8" Background="#33000000" Foreground="Lime" BorderBrush="#05000000" WindowStyle="ToolWindow" BorderThickness="0" ResizeMode="NoResize">
<Grid Margin="0,10,4,0">
<Grid.RowDefinitions>
<RowDefinition Height="33*"/>
<RowDefinition Height="173*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="18*"/>
<ColumnDefinition Width="61*"/>
</Grid.ColumnDefinitions>
<Button x:Name="buttonGetFiles" Content="Press to enable" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="160" Height="48" Background="#F2323232" Foreground="#FFFDA100" FontSize="18" Grid.Column="0" Grid.Row="0"/>
<ListBox x:Name="checkBoxList" HorizontalAlignment="Left" Margin="10,10,10,10" VerticalAlignment="Top" Width="160" Height="200" ItemsSource="{Binding MyItemsListProperty}" SelectionMode="Multiple" Background="#F2323232" Foreground="#FFFDA100" Grid.Column ="0" Grid.Row="1" IsEnabled="False" >
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="2">
<CheckBox IsChecked="{Binding isChecked}" BorderBrush="#FF000A64" Background="Lime" Foreground="Lime" Content="{Binding Content}" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Label x:Name="textLabel" Content="My Little Form" Grid.Column="1" Grid.Row ="0" HorizontalAlignment="Right" Margin="10,10,10,10" VerticalAlignment="Top" FontFamily="OCR A Extended" FontSize="42" Foreground="Lime" Height="48" />
</Grid>
</Window>

Answer 1

You have to define a style for ItemsPanelTemplate of the ListBox only.
Try this one as an example:
<Grid Margin="0,10,4,0">
<Grid.RowDefinitions>
<RowDefinition Height="33*"/>
<RowDefinition Height="173*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="18*"/>
<ColumnDefinition Width="61*"/>
</Grid.ColumnDefinitions>
<Button x:Name="buttonGetFiles" Content="Press to enable" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="160" Height="48" Background="#F2323232" Foreground="#FFFDA100" FontSize="18" Grid.Column="0" Grid.Row="0"/>
<ListBox x:Name="checkBoxList"
HorizontalAlignment="Left"
Margin="10,10,10,10"
VerticalAlignment="Top" Width="160" Height="200"
ItemsSource="{Binding MyItemsListProperty}"
SelectionMode="Multiple"
Foreground="#FFFDA100"
Grid.Column ="0" Grid.Row="1"
IsEnabled="False" >
<ListBox.Style>
<Style TargetType="ListBox">
<Setter Property="Background" Value="#F2323232"></Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding IsEnabled}" Value="False">
<Setter Property="Background" Value="#F2323232"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ListBox.Style>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel >
<StackPanel.Style>
<Style TargetType="StackPanel">
<Setter Property="Background" Value="#F2323232"></Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListBox}}, Path=IsEnabled}" Value="False">
<Setter Property="Background" Value="#AA323232"></Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</StackPanel.Style>
</StackPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="2">
<CheckBox IsChecked="{Binding isChecked}" BorderBrush="#FF000A64" Background="Lime" Foreground="Lime" Content="{Binding Content}" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Label x:Name="textLabel" Content="My Little Form" Grid.Column="1" Grid.Row ="0" HorizontalAlignment="Right" Margin="10,10,10,10" VerticalAlignment="Top" FontFamily="OCR A Extended" FontSize="42" Foreground="Lime" Height="48" />
</Grid>