WinForms: Autocomplete in multiline textbox

Does anybody know of any solution how to provide autocompletion suggestions (say to help input keywords from a list) for a multiline WinForms TextBox/RichTextBox?

For a single line textbox, this is v开发者_开发问答ery easy. Multiline is obviously not implemented directly by Winforms.

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I guess you could have a look at this article from codeproject.com, which seems to correspond to what you are looking for.