ComboBox and ListView Combination

[lsharva]

Actually, i m working on Windows Application where i have to use the ComboBox and listview in a way , as first we will click the comboBox and then as you click , ListView appear and when we select something , that will be selected at comboBox also and ListView will disappear, and comboBox item should get selected.
Here i m having a problem as comboBox gets empty when list View will apear
Focus and thatswhy selection become Error,

So plz help what should i do for this ,

ComboBox Click Event
]

private void cmbSta1So1_Click(object sender, EventArgs e)
        {
 
            ListView lv = new ListView();
 
            if (((ComboBox)sender).Tag.ToString() == "Start")
                lv = (ListView)lvChannels;
            //else
            //    lv = (ListView)lstCoeff;
 
 
            //lv.Tag = Aindex.ToString();
            lv.Left = ((ComboBox)sender).Left;
            lv.Top = ((ComboBox)sender).Top + ((ComboBox)sender).Height;
            lv.Visible = true;
            lv.Focus();
            if (((ComboBox)sender).Text == "")
                lv.Items[0].Selected = true;
            else
            {
                lv.Items[lv.FindItemWithText(((ComboBox)sender).Text).Index].Selected = true;
            }
        }
 
 

ListView CLick event

   private void lvChannels_Click(object sender, EventArgs e)
        {
             getChannels(((ListView)sender));
 
        }
 
        private void getChannels(ListView lstV)
        {
             //int Aindex = Int16.Parse(lstV.Tag.ToString());
            lstV.Visible = false;
 
            if (lstV.SelectedItems.Count > 0 && lstV.Name == "lvChannels")
            {
                MessageBox.Show(cmbCondSta1So1.Items.Count.ToString() );  
 
                    //cmbCondSta1So1.SelectedIndex = lstV.SelectedItems[0].Index ;
                    MessageBox.Show(cmbCondSta1So1.Items.Count.ToString());
                    cmbCondSta1So1.Focus();
 
            }
            lstV.Visible = false;
 
        }