Order.xaml

<UserControl xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
             x:Class="SalesApp.Ui.Desktop.View.Order"
             MinHeight="400"
             MinWidth="550">

  <StackPanel DataContext="{Binding Source={StaticResource Locator}}">
    <DataGrid ItemsSource="{Binding OrderViewModel.Products}"
              Margin="10"
              Width="650"
              Height="400"
              AutoGenerateColumns="False"
              BorderBrush="Black"
              BorderThickness="1">
      <DataGrid.Columns>
        <DataGridTemplateColumn Header="Name"
                                Width="250">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
              <StackPanel Orientation="Vertical">
                <TextBlock Padding="10 10 0 0"
                           Text="{Binding name}"
                           FontWeight="Bold"
                           FontSize="12" />
                <StackPanel Orientation="Horizontal">
                  <TextBlock Padding="10 0 0 5"
                             Text="{Binding brand_name, StringFormat={}brand: {0:#0}}"
                             FontSize="10" />
                  <TextBlock Padding="10 0 0 5"
                             Text="{Binding mass, StringFormat={}|   mass.: {0:#0.00} l}"
                             FontSize="10" />
                </StackPanel>
              </StackPanel>

            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Mass"
                            Binding="{Binding mass, Mode=OneWay, StringFormat={}   {0:#0.00} l}"
                            Width="120" />
        <DataGridTextColumn Header="Price"
                            Binding="{Binding price, Mode=OneWay, StringFormat={}  {0:#0.00}}"
                            Width="70" />
        <DataGridTemplateColumn Header="Amount"
                                Width="104">
          <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
              <StackPanel Orientation="Horizontal">

                <controls:NumericUpDown Value="{Binding amount, Mode=TwoWay UpdateSourceTrigger=PropertyChanged}"
                                        Minimum="0"
                                        controls:TextBoxHelper.Watermark="0"
                                        Width="87" />
              </StackPanel>

            </DataTemplate>
          </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Total Price"
                            Binding="{Binding total_price, StringFormat={}  {0:#0.00}}" />
      </DataGrid.Columns>
    </DataGrid>
    <Grid Margin="10">
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="320" />
        <ColumnDefinition Width="320" />
        <ColumnDefinition Width="*" />
      </Grid.ColumnDefinitions>
      <Grid Grid.Column="1">
        <Button Width="130"
                Content="send"
                HorizontalAlignment="Left" />
      </Grid>
      <Grid Grid.Column="2">
        <TextBlock Text="Total order price:"
                   Padding="0 5 0 0"
                   Margin="0 0 140 0"
                   FontSize="16" />
        <TextBlock Text="{Binding OrderViewModel.TotalPrice}"
                   Padding="0 2 0 0"
                   FontSize="20"
                   FontWeight="Bold"
                   HorizontalAlignment="Right" />
      </Grid>

    </Grid>


  </StackPanel>
</UserControl>