demka/demofinish/MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        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"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="demofinish.MainWindow"
        x:CompileBindings="False"
        Title="demofinish">

    <DockPanel>
        <StackPanel DockPanel.Dock="Top" Margin="10" HorizontalAlignment="Center" Orientation="Horizontal">
            <StackPanel Orientation="Vertical" Margin="5">
                <TextBlock Text=""/>
                <AutoCompleteBox x:Name="SearchBox" Watermark="Поиск" FilterMode="StartsWith" HorizontalAlignment="Center" Margin="5" Width="200" SelectionChanged="SearchBox_SelectionChanged"/>
            </StackPanel>
            <StackPanel Orientation="Vertical" Margin="5">
                <TextBlock Text="Тип агента"/>
                <ComboBox  x:Name="TypeAgentCombobox" Margin="5" Width="200">
                <ComboBox.ItemTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding}"/>
                    </DataTemplate>
                </ComboBox.ItemTemplate>
            </ComboBox>
            </StackPanel>
            
            <StackPanel Orientation="Vertical" Margin="5">
                <TextBlock Text="Сортировка приоритета"/>
                <ComboBox MaxDropDownHeight="100" Width="200" Margin="5" x:Name="PriorityCombobox">
                <ComboBoxItem>по убыванию</ComboBoxItem>
                <ComboBoxItem>по возрастанию</ComboBoxItem>
            </ComboBox>
            </StackPanel>
            
                <StackPanel Orientation="Vertical" Margin="5">
                    <TextBlock Text="Сортировка наименования"/>
                    <ComboBox MaxDropDownHeight="100" Width="200" Margin="5" x:Name="NameComboBox">
                <ComboBoxItem>по убыванию</ComboBoxItem>
                <ComboBoxItem>по возрастанию</ComboBoxItem>
            </ComboBox>
                </StackPanel>
                    <StackPanel Orientation="Vertical" Margin="5">
                        <TextBlock Text="Сортировка по скидке"/>
                        <ComboBox MaxDropDownHeight="100" Width="200" Margin="5" x:Name="SaleCombobox">
                <ComboBoxItem>по убыванию</ComboBoxItem>
                <ComboBoxItem>по возрастанию</ComboBoxItem>
            </ComboBox>
                    </StackPanel>
        </StackPanel>

        <ListBox x:Name="AgentListBox" SelectionChanged="AgentListBox_OnSelectionChanged">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <UniformGrid Columns="3"/>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Border BorderThickness="1" Margin="5">
                        <StackPanel HorizontalAlignment="Center" Spacing="5">
                            <Image HorizontalAlignment="Center" Width="100" Height="100" Source="{Binding LogoImage}" Margin="5"/>
                            <TextBlock Text="{Binding Title, StringFormat='Наименование: {0}'}"/>
                            <TextBlock Text="{Binding Phone, StringFormat='Телефон: {0}'}"/>
                            <TextBlock Text="{Binding Agenttypeid, StringFormat='Тип агента: {0}'}"/>
                        </StackPanel>
                    </Border>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Margin="10">
            <Button Content="Назад" Margin="5" Click="PrevPage_Click"/>
            <TextBlock Text="{Binding currentPage}" VerticalAlignment="Center" Margin="5"/>
            <TextBlock Text="{Binding pageCount}" VerticalAlignment="Center" Margin="5"/>
            <Button Content="Вперед" Margin="5" Click="NextPage_Click"/>
            <Button Content="Добавить агента" Margin="5" Click="AddNew_Agent" />
        </StackPanel>
    </DockPanel>
</Window>