title: Get selected index of `DataGridViewComboBox`
body: <p>When you add a <code>ComboBoxColumn</code> in <code>DataGridView</code>, I do not know how to handle the change event of <code>ComboBox</code>.</p>
  
  <pre><code>'Adding To DGV data on form load
  Dim cmbovoce As New DataGridViewComboBoxColumn()
  cmbovoce.HeaderText = "Fruit"
  cmbovoce.Name = "cmbovoce"
  cmbovoce.MaxDropDownItems = 4
  cmbovoce.Width = 100
  cmbovoce.Items.Add("apple")
  cmbovoce.Items.Add("pear")
  cmbovoce.Items.Add("cherries")
  cmbovoce.Items.Add("plums")
  DataGridView1.Columns.Add(cmbovoce)
  </code></pre>