Table and button problem

Questions
1

I have a table where students input numbers, when students hit after the last entry, all of the help buttons reveal themselves. Is there a way to prevent this?

2

I see the buttons even before. You need to put hidden sinks for the buttons.

hidden: not(isBlank(table.cellContent(1,1)) or isBlank(table.cellContent(1,2)) 
or isBlank(table.cellContent(2,1)) or isBlank(table.cellContent(2,2)) )
3

In the CL for the table or each button?

4

Each button needs it. To hide any particular component, that component needs a hidden sink.

5

Thank you for your help