Editable field

[Domi]

I made a small stack to teach the multiplication tables (a test)
In fact, it is a porting of a HC stack.
Translation was a breeze :-)

A little problem, though: the child is given a multiplication, say 4 
x 9; he must answer in a field. I can't focus on this field (nor type 
tab) for the *first* test of a series.
I have to resort on a rather inelegant way, i.e. "click at loc of field".
Is there a better way?
-- 
Regards,
Dominique