Agents/Functions/AgentEidtor.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="800" d:DesignHeight="450"
        x:Class="Agents.AgentEidtor"
        Title="Изменить агента"
		Icon="avares://Agents/Assets/Icon.ico"
		xmlns:vm="using:Agents.Models">
	
	<DockPanel Background="Blue">
		<ScrollViewer>
			
			<StackPanel Spacing="15">
			
				<StackPanel HorizontalAlignment="Center">
					<TextBlock Text="Выберите клиента для изменения"/>
					<ComboBox Name="ListAgents" HorizontalAlignment="Center" Width="300" SelectionChanged="ComboBox_SelectionChanged">
						<ComboBox.ItemTemplate>
							<DataTemplate x:DataType="vm:Agent">
								<TextBlock Text="{Binding Title}"/>
							</DataTemplate>
						</ComboBox.ItemTemplate>
					</ComboBox>
				</StackPanel>
				
				<StackPanel Spacing="15" HorizontalAlignment="Center" Orientation="Horizontal">

					<StackPanel Orientation="Vertical">
						<TextBlock Text="Введите новый приоритет"/>
						<NumericUpDown Value="" Width="150" Minimum="0" Name="TextNewPriority"/>
					</StackPanel>

					<StackPanel Orientation="Vertical">
						<TextBlock Text="Введите новый ИНН"/>
						<TextBox Width="300" x:Name="TextNewInn" Text=""/>
					</StackPanel>

					<StackPanel Orientation="Vertical">
						<TextBlock Text="Введите новый КПП"/>
						<TextBox Width="300" x:Name="TextNewKPP" Text=""/>
					</StackPanel>

				</StackPanel>
				
				<StackPanel Spacing="15" HorizontalAlignment="Center" Orientation="Horizontal">

					<StackPanel Orientation="Vertical">
						<TextBlock Text="Введите новый адрес"/>
						<TextBox Width="300" Height="90" x:Name="TextNewAddress" TextWrapping="Wrap" Text=""/>
					</StackPanel>

					<StackPanel Orientation="Vertical">
						<TextBlock Text="Введите новое имя директора"/>
						<TextBox Width="300" x:Name="TextNewDirectorname" Text=""/>
					</StackPanel>

					<StackPanel Orientation="Vertical">
						<TextBlock Text="Введите новую почту"/>
						<TextBox Width="300" x:Name="TextNewEmail" Text=""/>
					</StackPanel>

				</StackPanel>
		
				<StackPanel>
					<Button Content="Изменить данные" Click="ButtonUpdate" HorizontalAlignment="Center" Background="Green"/>
					<Button Content="Назад" Click="Exit" HorizontalAlignment="Center" Background="Green"/>
				</StackPanel>
				
				
				<TextBlock Name="Status" Text="" HorizontalAlignment="Center"/>
			
			</StackPanel>
		
		</ScrollViewer>
	</DockPanel>

</Window>