function AddItem(const Caption: string; const ImageIndex: Integer; const SelectedImageIndex: Integer; const OverlayImageIndex: Integer; const Indent: Integer; Data: TCustomData): TComboExItem;

__fastcall TComboExItem AddItem(const AnsiString Caption, const int ImageIndex, const int SelectedImageIndex, const int OverlayImageIndex, const int Indent, TCustomData Data);