Using "Modal dialog box" as a "pop-up"

Hello.

I have a transaction which has a selection screen and then, a modal dialog box.

I need to call this transaction skipping the selection screen. That's ok, it works fine using "CALL TRANSACTION 'XXX' AND SKIP FIRST SCREEN". The problem is that the background screen of the modal dialog box is not the selection screen of the original transaction.

I try explain better with a few caps. This is the original transaction:

When execute, it calls the second transaction, which has a selection screen, but it doesn't shown because I used "ANDSKIPFIRSTSCREEN":

I want the background screen remains being the selection screen of the original transaction, and the modal dialog box will be like a pop-up dialog.

Is it possible? Thanks in advance.