sa/Stars Assistant/Views/MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="using:net.nehmer.sa.ViewModels"
        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="net.nehmer.sa.Views.MainWindow"
        x:DataType="vm:MainWindowViewModel"
        Title="GetStartedApp">

        <!-- Icon="/Assets/avalonia-logo.ico" -->

    <Design.DataContext>
        <!-- This only sets the DataContext for the previewer in an IDE,
             to set the actual DataContext for runtime, set the DataContext property in code (look at App.axaml.cs) -->
        <vm:MainWindowViewModel/>
    </Design.DataContext>

    <StackPanel>
        <Border Margin="5" CornerRadius="10" Background="LightBlue">
            <TextBlock Margin="5" FontSize="24" HorizontalAlignment="Center" Text="{Binding Greeting}"></TextBlock>
        </Border>
        <Grid ShowGridLines="True" Margin="5" ColumnDefinitions="120, 100" RowDefinitions="Auto, Auto, Auto">  
            <Label Grid.Row="0" Grid.Column="0" Margin="10">Celsius</Label>
            <TextBox Grid.Row="0" Grid.Column="1" Margin="0 5" Text="0" Name="celsius"/>
            <Label Grid.Row="1" Grid.Column="0" Margin="10">Fahrenheit</Label>
            <TextBox Grid.Row="1"  Grid.Column="1" Margin="0 5" Text="0" Name="fahrenheit"/>
            <Button Grid.Row="2" Grid.Column="1" Margin="0 5" Click="ButtonClicked">Calculate</Button>
        </Grid>
        <DataGrid Margin="20" ItemsSource="{Binding Planets}"   
            AutoGenerateColumns="True" IsReadOnly="True" 
            GridLinesVisibility="All"
            BorderThickness="1" BorderBrush="Gray">
        </DataGrid>

        <!-- ScrollViewer>
            <ItemsControl ItemsSource="{Binding Planets}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate DataType="vm:PlanetViewModel">
                        <Grid ColumnDefinitions="200, 100, 50">
                            <TextBlock Grid.Column="0" Text="{Binding Name}"/>
                            <TextBlock Grid.Column="1" Text="{Binding Owner}"/>
                            <TextBlock Grid.Column="2" Text="{Binding Value}"/>
                        </Grid>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
        </ScrollViewer-->

  </StackPanel>

</Window>