Windowless Rich Text Controls

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Hi All. I've found an interesting article in MSDN. It called "Windowless Rich Edit Controls". I've also found c++ headers and samples at http://www.codeguru.com/Cpp/controls/richedit/windowless/article.php/c5367/, but I cannot rewrite the headers to Delphi. Does anybody know where I can find Delphi headers and/or examples with implementation of ITextHost and ITextServices interfaces?
Thanks.