As previously noted I am implementing "AutoFilter" functionality in the
DataGridView, similar to that seen in Excel. This is done by inserting a row
of DataGridViewComboBoxCell objects at position zero in the grid and filling
each combo with a list of possible values for the Column in which it resides.

I have this working but I am not happy with my implementation. In order to
be able to detect a user change in filter conditions (which must be applied
to the displayed data immediately) I have attached a listener to
SelectedItemChanged of the ComboBox which is created within the
DataGridViewComboBoxCell when the cell enters edit mode, as follows:

private void dataGridView1_CurrentCellChanged(object sender, EventArgs e)
{
   // snip...

   // we must enter edit mode for the combo to be activated
   dataGridView1.BeginEdit(false);
   ComboBox comboBox = dataGridView1.EditingControl as ComboBox;
   if (comboBox == null)
       return;

   // attach listener
   comboBox.SelectedValueChanged += new
EventHandler(comboBox_SelectedValueChanged);
}

This is awkward and I have had to add a lot of other code to support it.
What I would prefer is to just capture changes to the underlying cell rather
than the ComboBox, but such changes are not available until the user moves
focus to another cell. Can anyone give me suggestions as to how I might do
this without having to listen to ComboBox events?

Many Thanks

kh