title: Can't see dropdown items in Datagridviewcomboboxcell
body: <p>I have created Datagridviewcomboboxcells as follows, each of  which have 2-3 items.
  I'm able to see the Datagridviewcomboboxcells with the appropriate values inside the comboboxcell, but I'm not able to see the dropdown list when i click on the comboboxcell.</p>
  
  <p>Should I write a separate event handler to display the dropdown list ? Does it not dropdown by default ?</p>
  
  <pre><code>        Dim Dgv2cb_ColdStart As New DataGridViewComboBoxCell
          Dgv2cb_ColdStart.Items.Add("C:\pd_DelAll.pl")
          Dgv2cb_ColdStart.Items.Add("No Cold Start")
  
  
          dgv2.Rows.Add("ColdStart")
          dgv2.Rows(rowIndex).Cells(1) = Dgv2cb_ColdStart
          If temp_profile.ColdStart = "" Then
              dgv2.Rows(rowIndex).Cells(1).Value = Dgv2cb_ColdStart.Items(1)
          Else
              dgv2.Rows(rowIndex).Cells(1).Value = Dgv2cb_ColdStart.Items(0)
          End If
  </code></pre>
  
  <p>Surprising thing is the same code on another backup of the project works, but that is an older version that i can't use now.
  I'm not able to reproduce the error, as to what is causing the dropdown not to occur.</p>