style은....fsMDIChild 입니다..경호님께서 답변 해주신 것에 따라...

    TMDIChild *child;
    child = new TMDIChild(Application);
    child->Image->Picture->LoadFromFile(OpenDialog->FileName);
    child->ClientWidth = child->Image->Picture->Width;
    child->ClientHeight = child->Image->Picture->Height;
    child->Caption = OpenDialog->FileName;
    child->Show();


이래도.. error가...