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  4. Programmatically Extract an Elements Style with DefaultStyleKeyProperty
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="120" Width="220">
    
        
            
                
                    
                        
                                                        BorderBrush="{DynamicResource {x:Static SystemColors.InactiveBorderBrushKey}}"                          
                            BorderThickness="1" />
                        
                    
                
            
        
    
    
        
        
    

//File:Window.xaml.cs
using System;
using System.Reflection;
using System.Windows;
using System.Windows.Markup;
namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Type type = typeof(FrameworkElement);
            FieldInfo fieldInfo = type.GetField("DefaultStyleKeyProperty",BindingFlags.Static| BindingFlags.NonPublic);
            DependencyProperty defaultStyleKeyProperty =(DependencyProperty)fieldInfo.GetValue(MyProgressBar);
            object defaultStyleKey = MyProgressBar.GetValue(defaultStyleKeyProperty);
            Style style = (Style)Application.Current.FindResource(defaultStyleKey);
            string styleXaml = XamlWriter.Save(style);
            Console.WriteLine(styleXaml);
        }
    }
}