Mini Kabibi Habibi

<local:GridDemoModule x:Class="GridDemo.MasterDetailWithEF"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
    xmlns:local="clr-namespace:GridDemo"
 xmlns:dxdb="http://schemas.devexpress.com/winfx/2008/xaml/demobase"
 xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
    xmlns:dxgt="http://schemas.devexpress.com/winfx/2008/xaml/grid/themekeys"
 xmlns:collections="clr-namespace:System.Collections;assembly=mscorlib"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    mc:Ignorable="d" d:DesignHeight="400" d:DesignWidth="800"
 HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
    <dxdb:DemoModuleControl>
        <dxg:GridControl Grid.Row="1" Name="grid" AutoGenerateColumns="KeepOld">
            <dxg:GridControl.DetailDescriptor>
                <dxg:DataControlDetailDescriptor Name="gridDetailDescriptor" ItemsSourceBinding="{Binding Path=Orders}" ShowHeader="false">
                    <dxg:GridControl Name="detailGrid">
                        <dxg:GridControl.DetailDescriptor>
                            <dxg:DataControlDetailDescriptor ItemsSourceBinding="{Binding Path=Order_Details}" ShowHeader="false">
                                <dxg:GridControl Name="subDetailGrid">
                                    <dxg:GridControl.Columns>
                                        <dxg:GridColumn FieldName="Product.ProductName" />
                                        <dxg:GridColumn FieldName="UnitPrice" />
                                        <dxg:GridColumn FieldName="Quantity" />
                                        <dxg:GridColumn FieldName="TotalPrice"  UnboundType="Decimal"  UnboundExpression="[UnitPrice]*[Quantity]" />
                                        <dxg:GridColumn FieldName="Discount" />
                                    </dxg:GridControl.Columns>
                                    <dxg:GridControl.TotalSummary>
                                        <dxg:GridSummaryItem SummaryType="Sum" FieldName="TotalPrice" ShowInColumn="TotalPrice" />
                                        <dxg:GridSummaryItem SummaryType="Sum" FieldName="Quantity" ShowInColumn="Quantity" />
                                        <dxg:GridSummaryItem SummaryType="Count" ShowInColumn="Product.ProductName" />
                                    </dxg:GridControl.TotalSummary>
                                    <dxg:GridControl.View>
                                        <dxg:TableView Name="subDetailView" DetailHeaderContent="Order details" AutoWidth="True"
                                                       UseAnimationWhenExpanding="true" ShowColumnHeaders="True"
                                                       AllowFixedColumnMenu="true" ShowTotalSummary="True" />
                                    </dxg:GridControl.View>
                                </dxg:GridControl>
                            </dxg:DataControlDetailDescriptor>
                        </dxg:GridControl.DetailDescriptor>
                        <dxg:GridControl.Columns>
                            <dxg:GridColumn FieldName="OrderDate" />
                            <dxg:GridColumn FieldName="ShippedDate" />
                            <dxg:GridColumn FieldName="ShipPostalCode" />
                            <dxg:GridColumn FieldName="Freight" />
                            <dxg:GridColumn FieldName="ShipCountry" />
                        </dxg:GridControl.Columns>
                        <dxg:GridControl.TotalSummary>
                            <dxg:GridSummaryItem SummaryType="Sum" FieldName="Freight" ShowInColumn="Freight" />
                            <dxg:GridSummaryItem SummaryType="Count" ShowInColumn="OrderDate" />
                        </dxg:GridControl.TotalSummary>
                        <dxg:GridControl.View>
                            <dxg:TableView Name="detailView" DetailHeaderContent="Orders" UseAnimationWhenExpanding="true"
                                           ShowColumnHeaders="True"  AllowFixedColumnMenu="true" AutoWidth="True"
                                           ShowTotalSummary="True"/>
                        </dxg:GridControl.View>
                    </dxg:GridControl>
                </dxg:DataControlDetailDescriptor>
            </dxg:GridControl.DetailDescriptor>
            <dxg:GridControl.Columns>
                <dxg:GridColumn FieldName="ContactName" />
                <dxg:GridColumn FieldName="Country" />
                <dxg:GridColumn FieldName="City" />
                <dxg:GridColumn FieldName="Address" />
                <dxg:GridColumn FieldName="PostalCode"/>
                <dxg:GridColumn FieldName="CustomerID" />
            </dxg:GridControl.Columns>
            <dxg:GridControl.TotalSummary>
                <dxg:GridSummaryItem SummaryType="Count" ShowInColumn="ContactName" />
            </dxg:GridControl.TotalSummary>
            <dxg:GridControl.View>
                <dxg:TableView Name="masterView" DetailHeaderContent="Customers" AllowPerPixelScrolling="true" AllowFixedGroups="true"
                               NavigationStyle="Cell" AllowFixedColumnMenu="true" AutoWidth="True" ShowTotalSummary="True">
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="Loaded">
                            <i:InvokeCommandAction CommandName="ExpandMasterRow" CommandParameter="1"
                                                   Command="{Binding Commands.ExpandMasterRow, ElementName=masterView}" />
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                </dxg:TableView>
            </dxg:GridControl.View>
        </dxg:GridControl>
    </dxdb:DemoModuleControl>
</local:GridDemoModule>