CourseProject_ended/Hotel_Course_Project/AdminPage.xaml

<Page x:Class="Hotel_Course_Project.AdminPage"
      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:Hotel_Course_Project"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="Страница администратора" Loaded="Page_Loaded">

    <Grid>
        <TabControl>
            <TabItem Header="Персонал">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="40"></RowDefinition>
                        <RowDefinition></RowDefinition>
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="100"></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                        <ColumnDefinition></ColumnDefinition>
                    </Grid.ColumnDefinitions>

                    <Button x:Name="AddStaffBtn" Click="AddStaffBtn_Click">Добавить</Button>
                    <DataGrid x:Name="StaffList"></DataGrid>
                </Grid>
            </TabItem>
            <TabItem Header="Клиенты"></TabItem>
            <TabItem Header="Комнаты"></TabItem>
            <TabItem Header="История Платежей"></TabItem>
            <TabItem Header="Прочее"></TabItem>
        </TabControl>
    </Grid>
</Page>