MainView.xaml

<UserControl x:Class="ReportManagerServiceExample.Views.MainView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxb="http://schemas.devexpress.com/winfx/2008/xaml/bars"
    xmlns:dxr="http://schemas.devexpress.com/winfx/2008/xaml/ribbon"
    xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
    xmlns:dxrudex="http://schemas.devexpress.com/winfx/2008/xaml/reports/userdesignerextensions"
    xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm"
    xmlns:ViewModels="clr-namespace:ReportManagerServiceExample.ViewModels"
    mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300">
    <UserControl.DataContext>
        <ViewModels:MainViewModel/>
    </UserControl.DataContext>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition />
        </Grid.RowDefinitions>
        <dxr:RibbonControl ShowApplicationButton="False" RibbonStyle="Office2019">
            <dxr:RibbonDefaultPageCategory>
                <dxr:RibbonPage Caption="Home">
                    <dxr:RibbonPageGroup>
                        <dxb:BarSplitButtonItem Content="Reports" ActAsDropDown="True" LargeGlyph="{dx:DXImage Image=Print_32x32.png}" Glyph="{dx:DXImage Image=Print_16x16.png}">
                            <dxmvvm:Interaction.Behaviors>
                                <dxrudex:ReportManagerBehavior Service="{Binding ElementName=EmployeesReportService}" />
                            </dxmvvm:Interaction.Behaviors>
                        </dxb:BarSplitButtonItem>
                    </dxr:RibbonPageGroup>
                </dxr:RibbonPage>
            </dxr:RibbonDefaultPageCategory>
        </dxr:RibbonControl>

        <dxg:GridControl Grid.Row="1" ItemsSource="{Binding Employees}" Name="grid">
            <dxg:GridColumn FieldName="EmployeeID" />
            <dxg:GridColumn FieldName="Name" />
            <dxg:GridColumn FieldName="Department"/>
            
            <dxg:GridControl.TotalSummary>
                <dxg:GridSummaryItem SummaryType="Count" Alignment="Right" />
            </dxg:GridControl.TotalSummary>
            
            <dxg:GridControl.View>
                <dxg:TableView ShowFixedTotalSummary="True">
                    <dxmvvm:Interaction.Behaviors>
                        <dxrudex:GridReportManagerService x:Name="EmployeesReportService"/>
                    </dxmvvm:Interaction.Behaviors>
                </dxg:TableView>
            </dxg:GridControl.View>
        </dxg:GridControl>
    </Grid>
</UserControl>