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What you are looking to do is entirely possible, but it does come with a few bugs, so don't expect an easy ride. What you need to do is create a class that inherits from <code>HwndHost</code> and overrides the <code>BuildWindowCore()</code> method. See the example from Microsoft at <a href="http://msdn.microsoft.com/en-us/library/ms752055.aspx" rel="nofollow noreferrer">http://msdn.microsoft.com/en-us/library/ms752055.aspx</a> In the above example, they give you the notion of being able to put a Win32 control within your WPF form, but you can use the same architecture to load the <code>MainWindowhandle</code> of your created Notepad process into the child of the border. Like this: <pre><code>protected override HandleRef BuildWindowCore(HandleRef hwndParent) { ProcessStartInfo psi = new ProcessStartInfo("notepad.exe"); psi.WindowStyle = ProcessWindowStyle.Minimized; _process = Process.Start(psi); _process.WaitForInputIdle(); // The main window handle may be unavailable for a while, just wait for it while (_process.MainWindowHandle == IntPtr.Zero) { Thread.Yield(); } IntPtr notepadHandle = _process.MainWindowHandle; int style = GetWindowLong(notepadHandle, GWL_STYLE); style = style & ~((int)WS_CAPTION) & ~((int)WS_THICKFRAME); // Removes Caption bar and the sizing border style |= ((int)WS_CHILD); // Must be a child window to be hosted SetWindowLong(notepadHandle, GWL_STYLE, style); SetParent(notepadHandle, hwndParent.Handle); this.InvalidateVisual(); HandleRef hwnd = new HandleRef(this, notepadHandle); return hwnd; } </code></pre> Please keep in mind that you will need to import a few functions from the User32.dll to be able to set the style of the window and set the parent window handle: <pre><code>[DllImport("user32.dll")] private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong); [DllImport("user32.dll", SetLastError = true)] private static extern int GetWindowLong(IntPtr hWnd, int nIndex); [DllImport("user32")] private static extern IntPtr SetParent(IntPtr hWnd, IntPtr hWndParent); </code></pre> Also make sure that you are including: <pre><code>using System.Windows.Interop; using System.Diagnostics; using System.Runtime.InteropServices; using System.Threading; </code></pre> This is my first answer on a forum so please let me know if it needs some work. Also reference <a href="https://stackoverflow.com/questions/5028598/hosting-external-app-in-wpf-window">Hosting external app in WPF window</a> but don't worry about DwayneNeed stuff. Just use SetParent() as you see in my code above. Just be careful if you try embedding the app inside a tab page. You will encounter some fun there.
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