ScrollBox with Controls aligned to alClient, alTop

I have a ScrollBox where there exist a panel aligned to alLeft and
another one to alClient. Inside the panels I place in run-time Memo
Controls which change their heights to adjust them to their respective
numbers of lines. So when the user moves the Splitter Control placed on
the left of the ScrollBox the Memos automatically grow higher, that is,
they keep showing their full contents. Nice. But then some of them go
out of sight and the Vertical ScrollBar, even if its visible property is
true, does not show up, due to the fact that the panels have an
alignment other than alNone. Any help? THANKS.