title: Change the auto-complete behaviour of a textbox
body: <p>I have two doubts about the autocomplete feature of textboxes in C#.</p>
  
  <p>First, I want to display the full list, not only the ones that start with the given text, and secondly I want to prevent the auto-complete of specific options (some are category titles).</p>
  
  <p>I've been checking the textbox properties and there's nothing related to it, so probably the main question could be, Is there a way to modify / override the textbox events in order to handle the auto-complete actions? (I don't know if it applies to show the full list too)</p>