Filtering the WPF DataGrid automatically via the header (inline filtering)

<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:Labs.Filtering"
     xmlns:my="http://schemas.microsoft.com/wpf/2008/toolkit" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" x:Class="Labs.Filtering.Window1"
     Title="Window1" Height="468" Width="784" mc:Ignorable="d">
  
  
    <Grid>
        <local:FilteringDataGrid IsFilteringCaseSensitive="False" ItemsSource="{Binding}" IsReadOnly="True" AutoGenerateColumns="True" x:Name="dataGrid1"/>
    </Grid>
</Window>