public class TotalSummaryStyle :
    RowStyleBase

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:dxg="http://schemas.devexpress.com/xamarin/2014/forms/datagrid"
             xmlns:local="clr-namespace:DataGrid_CustomAppearance"
             x:Class="DataGrid_CustomAppearance.MainPage">
    <ContentPage.BindingContext>
        <local:TestOrderRepository/>
    </ContentPage.BindingContext>
    <dxg:DataGridView ItemsSource="{Binding Orders}" 
                      RowHeight="40" TotalSummaryHeight="40">

        <!-- Specify grid columns and total summaries here. -->

        <!--Customize the appearance of grid cells.-->
        <dxg:DataGridView.CellStyle>
            <dxg:CellStyle Padding="5" BackgroundColor="#333333" BorderColor="#515151"
                           FontSize="14" FontColor="White" 
                           SelectionColor="#f78a09" SelectionFontColor="Black"/>
        </dxg:DataGridView.CellStyle>

        <!--Customize the appearance of column headers.-->
        <dxg:DataGridView.ColumnHeaderStyle>
            <dxg:ColumnHeaderStyle BackgroundColor="#333333" BorderColor="#515151" 
                                   FontSize="16" FontColor="#929292" FontAttributes="Bold" 
                                   HorizontalLineThickness="2"/>
        </dxg:DataGridView.ColumnHeaderStyle>

        <!--Customize the appearance of the total summary panel.-->
        <dxg:DataGridView.TotalSummaryStyle>
            <dxg:TotalSummaryStyle Padding="2,10" BackgroundColor="#666666" BorderColor="#515151"
                                   FontSize="14" FontColor="#f78a09"/>
        </dxg:DataGridView.TotalSummaryStyle>
    </dxg:DataGridView>
</ContentPage>