-sender adds buttons

Hi juliebnXX, thanks for this amazing piece of software!

I think there's a bug when adding the **-sender** option. I'm using it to customize the notification message.
By adding it, the notification turns into an **alert**, by adding the **buttons** 'close' and 'show' so it doesn't disappear after a while, only when a button is hit.

Kind regards,
Federico.
