avaloniaProject/Views/Calculator.axaml

<UserControl xmlns="https://github.com/avaloniaui"
			 xmlns:vm="using:avaloniaPr.ViewModels"
             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:DataType="vm:MainWindowViewModel"
             x:Class="avaloniaPr.Calculator">
	<Grid Background="Gray">
		<Grid.RowDefinitions>
			<RowDefinition Height="0.1*"/>
			<RowDefinition Height="0.3*"/>
			<RowDefinition/>
			<RowDefinition Height="0.1*"/>
		</Grid.RowDefinitions>
		<Grid.ColumnDefinitions>
			<ColumnDefinition Width="0.3*"/>
			<ColumnDefinition/>
			<ColumnDefinition Width="0.3*"/>
		</Grid.ColumnDefinitions>
		<TextBlock Text="Calculator" Classes="centerTB" Grid.Column="1" Grid.Row="1"/>
		<StackPanel Grid.Row="2" Grid.Column="1">
			<TextBlock Text="{Binding CalculatorVM.TextCalculator}" Classes="TBLMain"/>
			<ComboBox SelectedValue="{Binding CalculatorVM.SV}" ItemsSource="{Binding CalculatorVM.ListItem}" Width="250"/>
		<StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Margin="0,30" Background="#87929c">
			<TextBox Text="{Binding CalculatorVM.OneNum}" Classes="TBCalculator"/>
			<TextBlock Text="{Binding CalculatorVM.SV}" Classes="TBLCalculator"/>
			<TextBox Text="{Binding CalculatorVM.TwoNum}" Classes="TBCalculator"/>
		</StackPanel>
			<Button Content="{Binding CalculatorVM.TextButton}" Command="{Binding CalculatorVM.CommandCalculator}" Classes="ButtonStyle"/>
			<TextBlock Text="{Binding CalculatorVM.Result, StringFormat = Результат {0}}" Classes="TBLMain"/>
		</StackPanel>
		</Grid>
</UserControl>