diff --git a/PInvoke/User32/MessagePump.cs b/PInvoke/User32/MessagePump.cs
index e4b49ed7..43e2c6ee 100644
--- a/PInvoke/User32/MessagePump.cs
+++ b/PInvoke/User32/MessagePump.cs
@@ -1,4 +1,5 @@
-using static Vanara.PInvoke.User32;
+using System;
+using static Vanara.PInvoke.User32;
 
 namespace Vanara.PInvoke;
 
@@ -24,6 +25,20 @@ public interface IMessagePump
 	int Run(IWindowCore mainWindow = null);
 }
 
+/// <summary>An interface that represents a Win32 window with created and destroyed events.</summary>
+public interface IWindowCore
+{
+	/// <summary>Occurs when the window is created and has a valid handle.</summary>
+	event Action Created;
+
+	/// <summary>Occurs when the window has been destroyed.</summary>
+	event Action Destroyed;
+
+	/// <summary>Gets the window handle.</summary>
+	/// <value>The window handle.</value>
+	HWND Handle { get; }
+}
+
 /// <summary>A basic message pump to use independently or with a window instance.</summary>
 /// <example>
 /// Simple example of a window creation and message pump.