Display the combo box on grid content double click

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C#

C#4.0

Hi Everyone,

I want to display the combo box inside the grid cell's when i double clicked on the cell. After the combo box open, on click the combo i want to display a new grid.

i have tried some code..

private ComboBox combo = new ComboBox();
       private void PONewMain_Load(object sender, EventArgs e)
       {
           combo.Hide();
           this.dataGridView1.Controls.Add(combo);

           string s = cmb_purchase.Text;

}

private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
       {

this.combo.Location = this.dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, true).Location;

combo.Text = dataGridView1.CurrentRow.Cells[0].Value.ToString();
            this.combo.Show();

}

It displaying the combo box, but i dont know how to set a event on combo mouseclick in the grid combo..

Please help

Thanks in advance