//============================================================================= private void StartupWindow_SourceInitialized(object sender, EventArgs e) { // m_WndHandle = new WindowInteropHelper(this).Handle; WindowsUtils.DisableMaximizeButton(m_WndHandle); WindowsUtils.EnableMinimizeButton(m_WndHandle); // WindowInteropHelper helper = new WindowInteropHelper(this); HwndSource source = HwndSource.FromHwnd(helper.Handle); source.AddHook(WndProc); }