// ....
    public override string ToString()
    {
        string display = string.Empty;

        display += ((Keyboard.Modifiers & ModifierKeys.Control) > 0) ? "Ctrl + " : string.Empty;
        display += ((Keyboard.Modifiers & ModifierKeys.Alt) > 0) ? "Alt + " : string.Empty;
        display += ((Keyboard.Modifiers & ModifierKeys.Shift) > 0) ? "Shift + " : string.Empty;
        display += ((Keyboard.Modifiers & ModifierKeys.Windows) > 0) ? "Win + " : string.Empty;
        display += PressedKey.ToString();
        return(display);
    }