prs/prs.desktop/Panels/PostCodes/PostCodeWindow.xaml

<Window x:Class="PRSDesktop.PostCodeWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:local="clr-namespace:PRSDesktop"
        mc:Ignorable="d"
        Title="Post Codes" Height="600" Width="400" WindowStartupLocation="CenterScreen">
    
    <!-- <local:PostCodePanel -->
    <!--     x:Name="PostCodePanel"  -->
    <!--     Margin="5" /> -->
    
    <local:LocalityTree
        x:Name="LocalityTree" 
        Margin="5"/>
    
</Window>