[C#] what event catches a change of value in a combobox in a DataGridViewCell?

DataGridView에 combobox cell을 추가한 상태에서 combobox의 값이 변경될 때 발생하는 이벤트 확인법

I want to handle the event when a value is changed in a ComboBox in a DataGridView cell. Theres the CellValueChanged event but that one doesn't fire until i click somewhere else inside the DataGridView. A simple ComboBox SelectedValueChanged does fire immidialy after a new value is selected. How can i add a listener to the combobox thats inside the cell ?

Thank you.

This is the code, which will fire the event of the selection in the comboBox in the dataGridView:

public Form1()
    {
        InitializeComponent();

        DataGridViewComboBoxColumn cmbcolumn = new DataGridViewComboBoxColumn();
        cmbcolumn.Name = "cmbColumn";
        cmbcolumn.HeaderText = "combobox column";
        cmbcolumn.Items.AddRange(new string[] { "aa", "ac", "aacc" });
        dataGridView1.Columns.Add(cmbcolumn);
        dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing);
    }

    private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        ComboBox combo = e.Control as ComboBox;
        if (combo != null)
        {
            combo.SelectedIndexChanged -= new EventHandler(ComboBox_SelectedIndexChanged);
            combo.SelectedIndexChanged += new EventHandler(ComboBox_SelectedIndexChanged);
        }
    }

    private void ComboBox_SelectedIndexChanged(object sender, EventArgs e)
    {
        ComboBox cb = (ComboBox)sender;
        string item = cb.Text;
        if (item != null)
            MessageBox.Show(item);
    }

출처 : http://stackoverflow.com/questions/5652957/what-event-catches-a-change-of-value-in-a-combobox-in-a-datagridviewcell