Final/pr13/Views/Courses.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             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"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="pr13.Courses"
             x:DataType="vm:MainWindowViewModel"
             xmlns:vm="using:pr13.ViewModels">
  <Grid RowDefinitions="*,8*">
    <StackPanel Orientation="Horizontal"  HorizontalAlignment="Center">
      <ComboBox  Width="150" SelectedItem="{Binding CourseVM.SelectedNameOrHour}" ItemsSource="{Binding CourseVM.OrderNameOrHours}"/>
      <ComboBox  Width="150" SelectedItem="{Binding CourseVM.SelectedFilter}" ItemsSource="{Binding CourseVM.FilterByHours}"/>
      <TextBox  Width="300" Text="{Binding CourseVM.NameOrHoursFind}" Watermark="Название курса или часы"></TextBox>
    </StackPanel>
    <ListBox ItemsSource="{Binding CourseVM.Courses}" Grid.Row="1">
      <ListBox.ItemTemplate>
        <DataTemplate>   
            <StackPanel>
              <TextBlock Text="{Binding Course1}"></TextBlock>
              <TextBlock Text="{Binding HoursCount}"></TextBlock>
              <TextBlock Text="{Binding CountTeachers}"></TextBlock>
            </StackPanel>
        </DataTemplate>
      </ListBox.ItemTemplate>
    </ListBox>
  </Grid>
</UserControl>