Controlling Elbro AB440R sockets via Raspberry Pi GPIO - how to do it?

Hello.
I have some radio controlled sockets and remotes for them,
These are sockets and remotes made by Elbro, remote control model AB440R.
I have a question, is it possible to control via RPi these remotes?
Through the GPIO in the RPi?
Currently I have the possibility to control ordinary relays via GPIO but to control the above mentioned remotes only a momentary short to ground is needed.
Unfortunately I do not have enough knowledge to do this.
Please help me in this matter.
thank you in advance

Regards: Damian

The easiest way is to take the remote control apart and see if it can be soldered on both sides of the button. And then e.g. relay and GPIO.