UIFIS/OUP/OUP.xaml

<Window x:Class="OUP.OUP"
        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:OUP"
        mc:Ignorable="d"
        Title="OUP" Height="450" Width="800" Loaded="Window_Loaded">
    <Grid>
        <DataGrid x:Name="Supply" FontSize="16" FontWeight="Bold" Margin="10" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Path = Product}" IsReadOnly="False" Header="Product" Width="150"/>
                <DataGridTextColumn Binding="{Binding Path = Date}" IsReadOnly="True" Header="Date" Width="180"/>
                <DataGridCheckBoxColumn  Binding="{Binding Path = IsDone, UpdateSourceTrigger=PropertyChanged}" IsReadOnly="False" Header="Delivered?" Width="120"/>
                <DataGridTextColumn Binding="{Binding Path = Description}" IsReadOnly="False" Header="Description" Width="*"/>
            </DataGrid.Columns>
        </DataGrid>

    </Grid>
</Window>