Hi,

My form has several group, combo and textboxs. To make it easier to
reproduce I've simplified:
1) one group box with a combobox and a textbox and the combo has the focus;
2) the user first selects and item from combobox and the focus passes to
textbox;
3) user doubleclicks on textbox and the current groupbox which fires this:
   a) current groupbox visible status changes to false;
   b) based on the information the user selected on the combobox, a
DatagridView is displayed in another groupbox, changing focus to it;
   c) and now, this is the problem, if the user uses the mouse roller then
combobox, in the invisible groupbox, SelectedItem is changed and I can't
explain why.

If the first groupbox stills visible, the problem does not occurs, but that
is not an aceptable solution, because the form remains with too much
information.

I hope my problem has become clear.

Thanks.
João.