oap_labs/WpfApp1/MainWindow.xaml

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid ShowGridLines="True">
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition />
            <RowDefinition Height="auto"/>
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200"/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>

        <!-- типа логотип компании -->
        <Image 
        Source="/img/1.jpg" 
        Grid.RowSpan="2" HorizontalAlignment="Right"/>
        <DataGrid
    Grid.Row="1"
    Grid.Column="1"
    CanUserAddRows="False"
    AutoGenerateColumns="False"
    ItemsSource="{Binding ClientList}">
            <DataGrid.Columns>
                <DataGridTextColumn
            Header="Имя"
            Binding="{Binding Name}"/>
                <DataGridTextColumn
            Header="Возраст"
            Binding="{Binding Age}"/>
                <DataGridTextColumn
            Header="Цена"
            Binding="{Binding Price}"/>
                <DataGridTextColumn
            Header="Место"
            Binding="{Binding Place}"/>
                <DataGridTextColumn
            Header="Категория"
            Binding="{Binding Category}"/>
                <DataGridTextColumn
            Header="Дата полета"
            Binding="{Binding DateFlight,StringFormat='dd.MM.yyyy'}"/>
                <DataGridTextColumn
            Header="IsActive"
            Binding="{Binding IsActive}"/>
            </DataGrid.Columns>

        </DataGrid>
        <StackPanel 
        Orientation="Vertical"
        Grid.RowSpan="3"
        VerticalAlignment="Bottom">
            <Button 
            x:Name="ExitButton"
            Content="Выход" 
            Click="ExitButton_Click"
            Height="50"/>
        </StackPanel>

        <WrapPanel
        Orientation="Horizontal"
        Grid.Column="1"
        MinHeight="50">
            <Label 
    Content="Искать:" 
    VerticalAlignment="Center"/>
            <TextBox
    Width="200"
    VerticalAlignment="Center"
    x:Name="SearchFilterTextBox" 
    KeyUp="SearchFilter_KeyUp"/>

            <ComboBox
    Name="CategoryFilterComboBox"
    SelectionChanged="ClientCategoryFilterComboBox_selectionChanged"
    VerticalAlignment="Center"
    MinWidth="100"
    SelectedIndex="0"
    ItemsSource="{Binding ClientCategoryList}">

                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <Label 
                Content="{Binding title}"/>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>
            <Label 
    Content="Цена:"
    VerticalAlignment="Center"/>
            <ComboBox
    Name="PriceFilterComboBox"
    SelectionChanged="ClientPriceFilterComboBox_selectionChanged"
    VerticalAlignment="Center"
    MinWidth="100"
    SelectedIndex="0"
    ItemsSource="{Binding ClientPriceList}">

                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <Label 
            Content="{Binding title}"/>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>
            <Label 
    Content="Возраст:" 
    VerticalAlignment="Center"/>
            <RadioButton
    GroupName="Age"
    Tag="1"
    Content="Сначала взрослые"
    IsChecked="True"
    Checked="RadioButton_Checked"
    VerticalAlignment="Center"/>
            <RadioButton
    GroupName="Age"
    Tag="2"
    Content="Сначала дети"
    Checked="RadioButton_Checked"
    VerticalAlignment="Center"/>
            <!-- минимальную высоту я тут поставил, чтобы верхнюю строку сетки было видно. В реальном приложении она не нужна -->
        </WrapPanel>
    </Grid>
</Window>