title: Way to get AutoComplete working in a DataGridViewComboBoxColumn?
body: <p>I've already successfully gotten autocomplete working in a regular combo box. I used the leave event to set the selection to null if the user types in something that isn't in the list.</p>
  
  <p>Now, I want to do this in a DataGridViewComboBoxColumn. However, the usual properties like AutoCompleteMode and AutoCompleteSource are missing. I hear there's a way get this done using casting somehow but I can't read the VB language instructions too well. Ideally I want to make a new derived class so I can easily use this thing over and over.</p>
  
  <p>The other problem is I need to know what event to intercept in order to reset the combobox to its old value or null if the item isn't in the list.</p>
  
  <p>Help would be appreciated! Thanks.</p>