Well, it not for an instance, but for the whole game. Several objects will be hidden.
Same concept. Use Global Variable instead.
Global Variable: PAUSED = 0
Create a random sprite, a small pink box(or any color you want) that's set invisible that serves only as a timer holder.
On PAUSED = 0 | [EVERYTHING in your game]
On [Paused Button] pressed | Set PAUSE to 1, Start Timer...
You get the picture.