Buzueva_Demo/BuzuevaDemo/Pages/ChangeData.xaml

<Page x:Class="BuzuevaDemo.Pages.ChangeData"
      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:BuzuevaDemo.Pages"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="245"
      Title="ChangeData">

    <Grid>
        <StackPanel Orientation="Vertical" HorizontalAlignment="Center" VerticalAlignment="Center" Width="200">
            <GroupBox Header="Наименование">
                <TextBox/>
            </GroupBox>
            <GroupBox Header="Тип агента">
                <ComboBox/>
            </GroupBox>
            <GroupBox Header="Приоритет">
                <TextBox/>
            </GroupBox>
            <GroupBox Header="Адрес">
                <TextBox/>
            </GroupBox>
            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                <GroupBox  Header="ИНН">
                    <TextBox Width="90"/>
                </GroupBox>
                <GroupBox  Header="КПП">
                    <TextBox  Width="90"/>
                </GroupBox>
            </StackPanel>
            <Image Width="100" Height="100"/>
            <Button Content="Внести изменения"/>
        </StackPanel>
    </Grid>
</Page>