Hi,
Here, ALV table is not in read only mode instead the view container is in disabled mode. i.e. alv table is not set to read only by using method SET_READ_ONLY( ) instead some where the whole view container is disabled by using SET_ENABLED( ABAP_FALSE ).
Note: If we put the alv table in read mode, it wont make any difference to the scroll bar.
Check your code, for setting read only mode.
Hope this helps you.
Regards,
Rama