Create a dialog in code, not in resource

Hi,
I want to create a dialog box but I can't use the resource editor. How can I do ? I saw the DLGTEMPLATE and
DLGITEMTEMPLATE structures. Am I in good way??
I accepted remarks, code samples, all that can help me.

Thanks for reply
Best Regard
David

I'd start with the CreateDialogIndirectParam API and read all related subjects in the online docs.