<Window x:Class="WpfApp1.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:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="200" Width="300">
    <Grid>
        <ComboBox x:Name="Test" Loaded="Test_Loaded" HorizontalAlignment="Center" Margin="0,24,0,0" VerticalAlignment="Top" Width="166"/>
    </Grid>
</Window>