Delphi. Remove a border of TabSheet of PageControl

Question

Is it possible to remove a border of TabSheet (~4px)? I am using PageControl as a switch-panel instead of frames, windows etc. I want everything will be straight.

Answer 1

unit Unit1;

interface

uses
  ...,
  CommCtrl;

type
  TPageControl = class(ComCtrls.TPageControl)
  private
    procedure TCMAdjustRect(var Msg: TMessage); message TCM_ADJUSTRECT;
  end;

  TForm1 = class(TForm)
    ...
  end;

...

procedure TPageControl.TCMAdjustRect(var Msg: TMessage);
begin
  inherited;
  if Msg.WParam = 0 then
    InflateRect(PRect(Msg.LParam)^, 4, 4)
  else
    InflateRect(PRect(Msg.LParam)^, -4, -4);
end;

...

end.

Answer 2

If you don't mind using third-party tools then the easiest solution would probably be to use TjvPageControl from JVCL. It has ClientBorderWidth property which you are looking for.