qwerty/AvaloniaApplication2/Views/Kaikylator.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="AvaloniaApplication2.Views.Kaikylator">
	<StackPanel HorizontalAlignment="Center">
		<TextBlock Text="Калькулятр" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="60,10,60,1">
		</TextBlock>
		<TextBlock Text="Выберите операцию" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="60,10,60,4">
		</TextBlock>
		<ComboBox Name="XMen" Margin="210,25,60,4">
		</ComboBox>
		<WrapPanel Margin="60,25,60,4">
		<TextBox Margin="60,10,60,4"> </TextBox>
		<TextBox Margin="60,10,60,4"> </TextBox>
		</WrapPanel>
		
		<TextBlock>
			<Button HorizontalAlignment="Center" VerticalAlignment="Center" Margin="195,10,60,4" >
				Вычислить
			</Button>
		</TextBlock>
			<TextBlock Text="Результат" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="60,10,60,4">
		</TextBlock>
		<TextBox Margin="60,10,60,4"> </TextBox>
		
	</StackPanel>
</UserControl>