Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
　　C1FlexGrid1.Styles.Add("ComboList1")
　　C1FlexGrid1.Styles("ComboList1").ComboList = "..."　' セルボタンを設定
　　C1FlexGrid1.SetCellStyle(2, 2, C1FlexGrid1.Styles("ComboList1"))
　　C1FlexGrid1.ShowButtons = C1.Win.C1FlexGrid.ShowButtonsEnum.Always
End Sub
Private Sub C1FlexGrid1_CellButtonClick(sender As Object, e As C1.Win.C1FlexGrid.RowColEventArgs) Handles C1FlexGrid1.CellButtonClick
　　MessageBox.Show("CellButtonClick")
End Sub

private void Form1_Load(object sender, EventArgs e)
{
　　c1FlexGrid1.Styles.Add("ComboList1");
　　c1FlexGrid1.Styles["ComboList1"].ComboList = "...";　// セルボタンを設定
　　c1FlexGrid1.SetCellStyle(2, 2, c1FlexGrid1.Styles["ComboList1"]);
　　c1FlexGrid1.ShowButtons = C1.Win.C1FlexGrid.ShowButtonsEnum.Always;
}
private void c1FlexGrid1_CellButtonClick(object sender, C1.Win.C1FlexGrid.RowColEventArgs e)
{
　　MessageBox.Show("CellButtonClick");
}