Hi Marcelo,
To set the Active recordID of a screen From a popup screen, you would need to assign a Shared Result with the desired RecordID within the popup screen, then retreive this value from the Shared Result into an Action Result on your main screen (using the Get Value from Shared Result action)
At this time, you should be able to set the Screens Active RecordId as the value from the Action Result you have created.
-Ben