Hi Emanuele.
I tried other, various settings (Desktop, AsTopLevel, ...) but without reaching the desired result.
At present I gave up the idea and choosed a different solution (a fixed editBox below the grid, but that doesn't please me), but still with the will to experiment again, as soon as possible.

Ciao. Bruno Maddalozzo

P.S.
I asked for you in Milan, during SMAU 2001, since we don' t live so far, but I was told you remained in the factory.