Problem with GUI Status and Leave-To-List-Processing

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I have a screen that after entering an input value, a list is displayed. I want to pick from the list, which gives me a value to use for setting another screen. My problem is with the GUI Status and LEAVE-TO-LIST-PROCESSING. When I SET PF-STATUS space, my list is displayed and I get default Cancel, Find, etc, but no PICK function code to check in PAI. When I set pf-status using my own gui status, nothing happens when I make a selection from the App. Tool Bar.

The following is a code sample of the above scenario, note that when I use "space" when setting pf-status and check sy-ucomm 'rw' it works. I unfortunately can't do a line selection, though. Does anyone know what I should do?

...ELSE.

CALL SCREEN 2500 STARTING AT 60 05

ENDING AT 85 15.

*****************************************

exits to PBO here.

*****************************************

IF sy-ucomm = 'CANCEL'.....

MODULE status_2500 OUTPUT.

LEAVE TO LIST-PROCESSING AND RETURN TO SCREEN 0.

SET PF-STATUS 'ZSTEELLST'.

SET TITLEBAR '800'.

SUPPRESS DIALOG.

LOOP AT display_itab.

WRITE: / display_itab-scpart.

WA_SCPART = display_itab-scpart.

HIDE WA_SCPART.

ENDLOOP.

REFRESH display_itab.

ENDMODULE. " STATUS_2500 OUTPUT