Setting CheckBox as UWP DataGrid column header during AutoGeneratingColumn

Hi @BitSmithy ,

Here is a workaround. It is hard to set ControlTemplate form code behind, wo can try to create a new style of DataGridColumnHeader in Xaml resource and use the style in event AutoGeneratingColumn.

   // xmlns:controls="using:Microsoft.Toolkit.Uwp.UI.Controls"
   // xmlns:wctprimitives="using:Microsoft.Toolkit.Uwp.UI.Controls.Primitives"
    <Grid>
        <Grid.Resources>
            <Style x:Name="dataGridcheckbostyle" TargetType="wctprimitives:DataGridColumnHeader">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="wctprimitives:DataGridColumnHeader">
                            <CheckBox Content="Test" />
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </Grid.Resources>
        <controls:DataGrid x:Name="dataGrid1" 
                Height="600" Margin="12"
                AutoGenerateColumns="True"
                AutoGeneratingColumn="dataGrid1_AutoGeneratingColumn"
                ItemsSource="{x:Bind CustomerList}">
            
        </controls:DataGrid>
    </Grid>

 public sealed partial class MainPage : Page
 {
     public List<Customer> CustomerList= new List<Customer>();
     public MainPage()
     {
         this.InitializeComponent();
         CustomerList = new List<Customer> {
             new Customer("A.", "Zero",
             "12 North Third Street, Apartment 45",
             false),
         new Customer("B.", "One",
             "34 West Fifth Street, Apartment 67",
             false),
         new Customer("C.", "Two",
             "56 East Seventh Street, Apartment 89",
             true),
         new Customer("D.", "Three",
             "78 South Ninth Street, Apartment 10",
             true)
         };
     
         
     }
     private void dataGrid1_AutoGeneratingColumn(object sender, Microsoft.Toolkit.Uwp.UI.Controls.DataGridAutoGeneratingColumnEventArgs e)
     {
         if (e.PropertyName == "IsNew")
         {
             
             e.Column.HeaderStyle = dataGridcheckbostyle;
         }
     }
 }

 public class Customer
 {
     public String FirstName { get; set; }
     public String LastName { get; set; }
     public String Address { get; set; }
     public Boolean IsNew { get; set; }
     public Customer(String firstName, String lastName,
        String address, Boolean isNew)
     {
         this.FirstName = firstName;
         this.LastName = lastName;
         this.Address = address;
         this.IsNew = isNew;
     }
 }

Thank you.

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