안녕하세요.

제목과 같은 구현이 필요해서 구글링 해보니

To create MDI child forms invisible you set their Visible property to False, and in addition you have to disable the VCL behaviour of force-showing them during creation. This happens by the FormStyle property setter of TCustomForm, which sets Visible to True for MDI child forms.

If you set the FormStyle in the object inspector, then the property setter will be called during form creation already, and the form will not be shown immediately, but only after the construction is complete. This allows you to reset the request to show the form, by overriding the AfterConstruction() method like so:

procedure TMDIChild.AfterConstruction;
begin
  Exclude(FFormState, fsVisible);
  inherited;
end;
This will create an invisible MDI child form.

To test this you can create a new MDI application in the IDE, override the method in the child form class like shown above, and simulate a long initialization:

procedure TMainForm.FileNew1Execute(Sender: TObject);
var
  i: integer;
begin
  for i := 1 to 10 do begin
    CreateMDIChild('NONAME' + IntToStr(MDIChildCount + 1));
    Update;
    Sleep(500);
  end;
  for i := 0 to MDIChildCount - 1 do
    MDIChildren[i].Visible := True;
end;
Without the overridden AfterConstruction() method it will create and show a MDI child every half second. With the overridden method it will show them all after a busy period of 5 seconds, which will give you the chance to show your splash screen instead.

이렇게 되어 있는데 제 실력으로는 어떻게 해야 할 지 몰라서요... (CBuilder로는 어떻게 해야 하는지요? ㅠ,ㅠ)

많은 조언 부탁 드립니다.