How to trigger PBO after POV?

Hi gurus,

I have requirement that a field with a multiple selection F4 in TMG, if select multiple values from F4 then need display those selected values in TMG. 

TMG only have 'Overview' screen as below screenshot:

Click 'New Entries',

F4 popup a multiple selection window:

If i ticked 2 and 4 line, this two entries should display on screen, but it not. I must click 'Enter' to trigger 'PBO' event, those value will display out.

How to achieve my requirement? thanks.

Regards,

Archer