ReportBuilder 7 no longer includes the global ppParentWnd due to modifications required for thread-safety.

You have two choices:

1. Modify TWPCustomRichTextForPP (or create a descendant class). Override the CreateParams as shown below. CreateParams is a protected method of TWinControl. (note: This is the approach that RB uses so that RichText can be thread-safe for RB Server.)
   
   Delphi/Pascal

   procedure TWPCustomRichTextForPP.CreateParams(var Params: TCreateParams); begin inherited CreateParams(Params); {remove ws-child so that no parent window is required} Params.Style := Params.Style and not(WS_CHILD); end; {procedure, CreateParams}

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   procedure TWPCustomRichTextForPP.CreateParams(var Params: TCreateParams); begin     inherited CreateParams(Params);     {remove ws-child so that no parent window is required}   Params.Style := Params.Style and not(WS_CHILD);   end; {procedure, CreateParams}

2. Create an invisble form and use that as the parent. (Note: This is not thread-safe).