No KeyDown detected on a new Window presented with ShowDialog (a mouse click is required before working)

Question

Hello,
I shorter the code.
In MainWindow I have a button to open a SecondWindow 
private void ButtonNextWindow_Click(object sender, RoutedEventArgs e)
            WindowState = WindowState.Minimized;
            var secondWindow = new SecondWindow();
            secondWindow.ShowDialog();
            WindowState = WindowState.Normal;
In the second window class I declared a KeyDown event called onKeyDown
private void onKeyDown(object sender, KeyEventArgs e)
            MessageBox.Show("Key Pressed");
well... it works only if I first click in the Second Window with the mouse, wherever I want.
I would avoid this click; seems something related with the Keyboard focus.
Thanks in advance,
Vincenzo

Answer 1

Set second window to focus after you set first window state to normal
private void ButtonNextWindow_Click(object sender, RoutedEventArgs e)
            WindowState = WindowState.Minimized;
            var secondWindow = new SecondWindow();
            secondWindow.ShowDialog();
            WindowState = WindowState.Normal;
secondWindow.Focus();