private void ActivateMainWindow()
{
var mainWindow = new MainWindow();
// registers a callback to intercept WM_SHOWFIRSTINSTANCE messages so that when a second
// instance broadcasts that message, original instance will be able to receive it and respond
// by activating itself and making sure it isn't hidden.
mainWindow.SourceInitialized += ( sender, e ) =>
{
HwndSource source = HwndSource.FromHwnd( new WindowInteropHelper( mainWindow ).Handle );
source.AddHook( new HwndSourceHook( ShowFirstInstanceWinHook ) );
};
mainWindow.Show();
}
