Make the first row in edit mode

WPf Datagrid. I have a button in the view; when I click it. It insert the new blank row in the grid.

public ObservableCollection<MyModel> GridCollection { get; set; }
public void AddNewRow()
{
    GridCollection.Insert(0, new MyaModel());
}

My requirement is that I want all the cells in the first row, either a textbox or combobox. The rest rows in the grid are still readonly only.

<DataTemplate>
                    <TextBox Text="{Binding Name}">
                        <TextBox.Style>
                            <Style TargetType="TextBox">
                                 <Style.Triggers>
                                      <DataTrigger Binding="{Binding EditVisibility" Value="Visible">
                                         <Setter Property="IsReadOnly"  Value="True" />
                                     </DataTrigger>

What I have tried:

I use the

<DataGridTemplateColumn.CellTemplate>

to trigger the style, but it applyed to all rows.

Maybe I have to use behavior or CellEditingTemplate?

Tags: XAML, WPF, DataTemplate