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copied!<p>This is too long to post as a comment...</p> <p>I think the problem you are running in to is the way you wrapped the code I presented in the ShowDialog overload. If you follow what your <code>GetWindowFromHost</code> code is doing it goes through the following steps:</p> <ol> <li>Creates a new IntPtr from the hwnd given.</li> <li>Creates a new NativeWindow object and assigns it's handle to be the IntPtr.</li> <li>Sets the IntPtr (in the finally block) to be IntPtr.Zero.</li> </ol> <p>I think it's this finally block that is causing you problems. In my code, the finally block would run after the call to <code>this.ShowDialog(nativeWindow)</code> finished. At that point the handle (IntPtr) was no longer being used. In your code, you are returning an <code>IWin32Window</code> that should still be holding a reference to that IntPtr, which at the time you call <code>launchTarget.ShowDialog(parentWindow)</code> is IntPtr.Zero.</p> <p>Try changing your code to look like this:</p> <pre><code>private NativeWindow GetWindowFromHost(int hwnd) { IntPtr handle = new IntPtr(hwnd); NativeWindow nativeWindow = new NativeWindow(); nativeWindow.AssignHandle(handle); return window; } </code></pre> <p>And then change your calling code to look like this:</p> <pre><code>Form launchTarget = FormFactory.GetForm(xxx); // psuedo-code for generic form loaderlaunchTarget.StartPosition = FormStartPosition.CenterParent; NativeWindow parentWindow = GetWindowFromHwnd(hwnd); try { launchTarget.ShowDialog(parentWindow); } finally { parentWindow.DestroyHandle(); } </code></pre> <p>These changes should work, but again this is untested.</p>

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