Agents/MainWindow.axaml

<Window 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="1000" d:DesignHeight="450"
        x:Class="Agents.MainWindow"
        Title="Агенты"
		Icon="avares://Agents/Assets/Icon.ico"
	    xmlns:vm="using:Agents.Models">
	<DockPanel Background="Blue">
		<ScrollViewer>
			<StackPanel>

				<StackPanel Orientation="Horizontal">
					<Border
					Background="Red"
					CornerRadius="10"
					Padding="20"
					Margin="20"
					Width="450"
					Height="400"
					>
						<ScrollViewer>
							<StackPanel>
								<TextBlock Text="Список компаний" HorizontalAlignment="Center" Foreground="Blue"/>
								<ListBox Name="ListAgents" SelectionChanged="ListBox_SelectionChanged">
									<ListBox.ItemTemplate>
										<DataTemplate x:DataType="vm:Agent">
											<StackPanel Background="White" HorizontalAlignment="Center" Width="400" Height="350" Spacing="5">

												<StackPanel HorizontalAlignment="Left">
													<Image
														Height="200"
														Width="200"
														Name="MainImage"
														Source="{Binding getLogo}"
												/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Название компании: " Foreground="Black"/>
													<TextBlock Text="{Binding Title}" Foreground="Black"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="ИНН: " Foreground="Black"/>
													<TextBlock Text="{Binding Inn}" Foreground="Black"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="КПП: " Foreground="Black"/>
													<TextBlock Text="{Binding Kpp}" Foreground="Black"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Имя директора: " Foreground="Black"/>
													<TextBlock Text="{Binding Directorname}" Foreground="Black"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Телефон компании: " Foreground="Black"/>
													<TextBlock Text="{Binding Phone}" Foreground="Black"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Адрес: " Foreground="Black"/>
													<TextBlock Text="{Binding Address}" Foreground="Black" Width="350" TextWrapping="Wrap"/>
												</StackPanel>

											</StackPanel>
										</DataTemplate>
									</ListBox.ItemTemplate>
								</ListBox>
							</StackPanel>
						</ScrollViewer>
					</Border>


					<StackPanel>
					<TextBlock Text="Веберите сортировку списка продуктов компании" HorizontalAlignment="Center"/>
					<ComboBox Name="SortListAgents" HorizontalAlignment="Center">
						<ComboBoxItem>
							без. сорт.
						</ComboBoxItem>
						<ComboBoxItem>
							убыв.
						</ComboBoxItem>
						<ComboBoxItem>
							возраст.
						</ComboBoxItem>
					</ComboBox>

					<Border
					Background="Red"
					CornerRadius="10"
					Padding="20"
					Margin="20"
					Width="450"
					Height="400"
					>
						<ScrollViewer>
							<StackPanel>
								<TextBlock Text="Товары продавца" HorizontalAlignment="Center" Foreground="Blue"/>
								<ListBox Name="ListProducts" SelectionChanged="ListBox_SelectionChanged1">
									<ListBox.ItemTemplate>
										<DataTemplate x:DataType="vm:Product">
											<StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Название продукта: "/>
													<TextBlock Text="{Binding Title}"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Описание товара: "/>
													<TextBlock Text="{Binding Description}"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Название продукта: "/>
													<TextBlock Text="{Binding Productionpersoncount}"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Артикул: "/>
													<TextBlock Text="{Binding Articlenumber}"/>
												</StackPanel>

												<StackPanel Orientation="Horizontal">
													<TextBlock Text="Минимальная цена для агента: "/>
													<TextBlock Text="{Binding Mincostforagent}"/>
													<TextBlock Text=" Руб."/>
												</StackPanel>

											</StackPanel>
										</DataTemplate>
									</ListBox.ItemTemplate>
								</ListBox>
							</StackPanel>
						</ScrollViewer>
					</Border>
					</StackPanel>
				</StackPanel>
				<StackPanel>
				<Border
				Background="Red"
				CornerRadius="10"
				Padding="20"
				Margin="20"
				Height="80"
					>
					<StackPanel HorizontalAlignment="Center">
						<TextBlock Text="Доступные функции" HorizontalAlignment="Center" Foreground="Blue"/>
						<StackPanel Orientation="Horizontal" Background="Red" HorizontalAlignment="Center">
							<Button Content="Обновить продукт" Click="ButtonProductEidtor" Background="Green"/>
							<Button Content="Изменить агентов" Click="ButtonAgentEidtor"  Background="Green"/>
							<Button Content="Добавление и удаление продукта" Click="ButtonAddProduct"  Background="Green"/>
							<Button Content="Редактированть данные продуктов" Click="ButtonProductEidtor"  Background="Green"/>
						</StackPanel>
					</StackPanel>
				</Border>
				</StackPanel>
			</StackPanel>
		</ScrollViewer>
	</DockPanel>
</Window>