base class undefined

When i try to compile, i get error: error C2504: 'CDHtmlDialog' : base class undefined

How can i resolve this?
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I would say that the base class, in this case "CDHtmlDialog" is not defined in that file
or the header where that class is defined is not included in this file.

Hope this helps

mammouthAuthor Commented:
CDHtmlDialog were added with microsoft web browser activeX under MFC.
I guess there must be some kind of header you must include.

Header is 'afxdhtml.h'.  It is new in MFC with VS .NET.

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