for the neet of my PocketPC applicatino (compact framework) I designed my
own table control.
it features type dependant editor for each individual cells, as a child
control I show when I edit a cell (basically when I clic in a cell on the
selected row)

my concern is when stop editing ?
I'm a bit short of good idea....

initially I wanted to stop editing when the editing control lots the focus,
and that's not good because some editor feature a small popup which could
grab the focus.
worst, the up down arrow in the NumericUpDown class are non-managed child
control which fetch the focus.....

I wonder if there is a way to follow the focus ? to always know which
control has it, so I could have a better test (if it change, I check all the
hierarchy of the newly focused control)