Slice/StoreServer/MonitoringCashierPage.xaml

<Page x:Class="StoreServer.MonitoringCashierPage"
      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:local="clr-namespace:StoreServer"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="Состояние касс">

    <Grid>
        <TabControl>
            <TabItem Header="Состояния касс">
                <TabControl>
                    <Grid>
                        <DataGrid x:Name="ListCashier" AutoGenerateColumns="False">
                            <DataGrid.Columns>
                                <DataGridTextColumn Header="Номер кассы" Binding="{Binding Cashier.CashierID}"></DataGridTextColumn>
                                <DataGridTextColumn Header="Статус" Binding="{Binding IsStartCashier}"></DataGridTextColumn>
                                <DataGridTextColumn Header="Кассир" Binding="{Binding EmployeeInStore.Employee.FullName}"></DataGridTextColumn>
                                <DataGridTextColumn Header="Состояние смены" Binding="{Binding IsStartWorkShift}"></DataGridTextColumn>
                            </DataGrid.Columns>
                        </DataGrid>
                    </Grid>
                </TabControl>
            </TabItem>
            <TabItem Header="Отчёты">
                <Grid>
                    
                </Grid>
            </TabItem>
        </TabControl>
        
    </Grid>
</Page>