Datatemplate with Converter for background not working.

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C#

WPF

Hey,

So I have a WPF C# application that I am developing.
Currently I am working on a screen that should, on the left, display a list of objects.
Each of these objects has a "ResultState" field that should be used to determine the background colour of the item in the list.

I have created a ResultStateConverter that turns the value into a Brush and have added this as a resource into my window.

This is what my XMAL looks like:

<Window.Resources>
		<converters:ResultStateToColour x:Key="ResultStateToColourConverter" />
		<DataTemplate DataType="{x:Type metaClasses:CustomerProcessingResult}">
				<Label Content="{Binding CustomerName}" FontWeight="Bold" 
						   Background="{Binding ResultState, 
                        Converter={StaticResource ResultStateToColourConverter}}" />
		</DataTemplate>
	</Window.Resources>
	<Grid>
		<Grid.ColumnDefinitions>
			<ColumnDefinition Width="5"></ColumnDefinition>
			<ColumnDefinition></ColumnDefinition>
			<ColumnDefinition></ColumnDefinition>
			<ColumnDefinition Width="5"></ColumnDefinition>
		</Grid.ColumnDefinitions>
		<Grid.RowDefinitions>
			<RowDefinition Height="5"></RowDefinition>
			<RowDefinition></RowDefinition>
			<RowDefinition></RowDefinition>
			<RowDefinition Height="5"></RowDefinition>
		</Grid.RowDefinitions>
		
		<ListBox Grid.Column="1" Grid.Row="1" Width="150" x:Name="ListCustomerResults" >
			
			
		</ListBox>

However, when I set my item source in code behind, no colours are being set on the backgrounds.
I put a break point in my converter and it is being triggered, and the correct value is being received/returned.

Why would this not be applying the colour correctly?

Thanks