(1)ComboDropDownイベント
　　ドロップダウンリストを表示したタイミング
(2)ComboSelChangeイベント
　　ドロップダウンリスト上の選択項目を変更したタイミング（選択確定ではありません）
(3)ComboCloseUpイベント
　　ドロップダウンリストを閉じたタイミング（選択確定）

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
　　Dim c As New FarPoint.Win.Spread.CellType.ComboBoxCellType
　　c.Items = New String() {"aaa", "bbb", "ccc"}
　　FpSpread1.ActiveSheet.Cells(0, 0).CellType = c
End Sub

Private Sub FpSpread1_ComboDropDown(ByVal sender As Object, ByVal e As FarPoint.Win.Spread.EditorNotifyEventArgs) Handles FpSpread1.ComboDropDown
　　Console.WriteLine("ComboDropDownイベント時の値：" + FpSpread1.ActiveSheet.Cells(0, 0).Text)
End Sub

Private Sub FpSpread1_ComboSelChange(ByVal sender As Object, ByVal e As FarPoint.Win.Spread.EditorNotifyEventArgs) Handles FpSpread1.ComboSelChange
　　Console.WriteLine("ComboSelChangeイベント時の値：" + FpSpread1.ActiveSheet.Cells(0, 0).Text)
End Sub

Private Sub FpSpread1_ComboCloseUp(ByVal sender As Object, ByVal e As FarPoint.Win.Spread.EditorNotifyEventArgs) Handles FpSpread1.ComboCloseUp
　　Console.WriteLine("CComboCloseUpイベント時の値：" + FpSpread1.ActiveSheet.Cells(0, 0).Text)
End Sub

private void Form1_Load(object sender, EventArgs e)
{
　　FarPoint.Win.Spread.CellType.ComboBoxCellType c = new FarPoint.Win.Spread.CellType.ComboBoxCellType();
　　c.Items = new string[] { "aaa", "bbb", "ccc" };
　　fpSpread1.ActiveSheet.Cells[0, 0].CellType = c;
}

void fpSpread1_ComboDropDown(object sender, FarPoint.Win.Spread.EditorNotifyEventArgs e)
{
　　Console.WriteLine("ComboDropDownイベント時の値：" + fpSpread1.ActiveSheet.Cells[0, 0].Text);
}

void fpSpread1_ComboSelChange(object sender, FarPoint.Win.Spread.EditorNotifyEventArgs e)
{
　　Console.WriteLine("ComboSelChangeイベント時の値：" + fpSpread1.ActiveSheet.Cells[0, 0].Text);
}

void fpSpread1_ComboCloseUp(object sender, FarPoint.Win.Spread.EditorNotifyEventArgs e)
{
　　Console.WriteLine("ComboCloseUpイベント時の値：" + fpSpread1.ActiveSheet.Cells[0, 0].Text);
}