MainWindow.xaml

<Window x:Class="Built_in_Mask.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:Built_in_Mask" 
        xmlns:syncfusion="http://schemas.syncfusion.com/wpf"
        mc:Ignorable="d" WindowStartupLocation="CenterScreen"
        Title="PropertyGrid - Built-in Mask" Height="600" Width="600">
    <Grid>
        <syncfusion:PropertyGrid SelectedObject="{Binding BuiltInMask}"
                                 DescriptionPanelVisibility="Visible"
                                 x:Name="propertyGrid"
                                 Margin="30">
            <syncfusion:PropertyGrid.DataContext>
                <local:BuiltInMaskViewModel/>
            </syncfusion:PropertyGrid.DataContext>
        </syncfusion:PropertyGrid>
    </Grid>
</Window>