ESOFT_LR/ROGOZ/Pages/TaskList.xaml

<Page x:Class="ROGOZ.Pages.TaskList"
      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:ROGOZ.Pages"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="TaskList">

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="30"/>
            <RowDefinition Height="30"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
            <ComboBox Margin="5" Width="200" Height="30" Name="ComboSortBy" FontSize="16">
                <ComboBoxItem Content="По исполнителю"/>
                <ComboBoxItem Content="По статусу"/>
            </ComboBox>

            <ComboBox Margin="5" Width="200" Height="30" Name="ComboDiscount" FontSize="16">
                <ComboBoxItem Content="Все"/>
                <ComboBoxItem Content="Не придумал"/>
            </ComboBox>

            <TextBox Name="TBoxSearch" Width="200" Height="30" Margin="5" FontSize="18"/>

        </StackPanel>
        <DataGrid Grid.Row="2" x:Name="DGTasks" AutoGenerateColumns="False" ItemsSource="{Binding}" RenderTransformOrigin="0.5,0.5" Margin="10,10,10,41">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Задача" Binding="{Binding Title}" Width="320"/>
                <DataGridTextColumn Header="Статус" Binding="{Binding Description}" Width="80"/>
                <DataGridTextColumn Header="Исполнитель" Binding="{Binding ExecutorID}" Width="140"/>
                <DataGridTextColumn Header="Менеджер" Width="*"/>
            </DataGrid.Columns>
        </DataGrid>

        <Button Content="Добавить" Grid.Row="2" Width="150" Height="30" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="100,5" Click="BtnAdd_Click"/>
        <Button Content="Удалить" Grid.Row="2" Width="150" Height="30" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="100,5" Click="BtnDel_Click"/>

    </Grid>
</Page>