title: asp.net: combobox or listbox PLUS checkbox
body: <p>i need a solution like this:</p>
  
  <p><a href="http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/checkboxes/defaultcs.aspx" rel="nofollow">http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/checkboxes/defaultcs.aspx</a></p>
  
  <p>however, i need the user to be able to add entries in here.</p>
  
  <p>does such a control already exist?</p>
  
  <p>it can be either jquery or asp.net</p>
  
  <p>it also does not have to be a combobox, it can be a listbox. i need to have every item have a checkbox next to it and be able to add a comment for each entry.</p>