[novato_erick]

con el link proporcionado por beginner01 la cual le doy las gracias y si era lo que deseaba no he logrado la manera en que cada formulario que yo desee aparezca independientemente en un tapSheet.

Este es el codigo el cual permite poner un boton en el componente PageControl cabe destacar el PageControlCloseButton es el nombre que se le dio al componente lo demas son eventos creados.

Código Delphi [-]
procedure TfrPrincipal.PageControlCloseButtonDrawTab(Control: TCustomTabControl;
  TabIndex: Integer; const Rect: TRect; Active: Boolean);
var
  CloseBtnSize: Integer;
  pagecontrol: TPageControl;
  TabCaption: TPoint;
  CloseBtnRect: TRect;
  CloseBtnDrawState: Cardinal;
  CloseBtnDrawDetails: TThemedElementDetails;

begin
  pagecontrol := Control as TPageControl;

  if InRange(TabIndex, 0, Length(FCloseButtonsRect) - 1) then
  begin
    CloseBtnSize := 14;
    TabCaption.Y := Rect.Top + 3;

    if Active then
    begin
      CloseBtnRect.Top := Rect.Top + 4;
      CloseBtnRect.Right := Rect.Right - 5;
      TabCaption.X := Rect.Left + 6;
    end
    else
    begin
      CloseBtnRect.Top := Rect.Top + 3;
      CloseBtnRect.Right := Rect.Right - 5;
      TabCaption.X := Rect.Left + 3;
    end;

    CloseBtnRect.Bottom := CloseBtnRect.Top + CloseBtnSize;
    CloseBtnRect.Left := CloseBtnRect.Right - CloseBtnSize;
    FCloseButtonsRect[TabIndex] := CloseBtnRect;

    pagecontrol.Canvas.FillRect(Rect);
    pagecontrol.Canvas.TextOut(TabCaption.X, TabCaption.Y,
      pagecontrol.Pages[TabIndex].Caption);

    if not UseThemes then
    begin
      if (FCloseButtonMouseDownIndex = TabIndex) and FCloseButtonShowPushed then
        CloseBtnDrawState := DFCS_CAPTIONCLOSE + DFCS_PUSHED
      else
        CloseBtnDrawState := DFCS_CAPTIONCLOSE;

      Windows.DrawFrameControl(pagecontrol.Canvas.Handle,
        FCloseButtonsRect[TabIndex], DFC_CAPTION, CloseBtnDrawState);
    end
    else
    begin
      Dec(FCloseButtonsRect[TabIndex].Left);

      if (FCloseButtonMouseDownIndex = TabIndex) and FCloseButtonShowPushed then
        CloseBtnDrawDetails := ThemeServices.GetElementDetails
          (twCloseButtonPushed)
      else
        CloseBtnDrawDetails := ThemeServices.GetElementDetails
          (twCloseButtonNormal);

      ThemeServices.DrawElement(pagecontrol.Canvas.Handle, CloseBtnDrawDetails,
        FCloseButtonsRect[TabIndex]);
    end;
  end;
end;

procedure TfrPrincipal.PageControlCloseButtonMouseDown(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
  I: Integer;
  pagecontrol: TPageControl;
begin
  pagecontrol := Sender as TPageControl;

  if Button = mbLeft then
  begin
    for I := 0 to Length(FCloseButtonsRect) - 1 do
    begin
      if PtInRect(FCloseButtonsRect[i], Point(X, Y)) then
      begin
        FCloseButtonMouseDownIndex := I;
        FCloseButtonShowPushed := True;
        pagecontrol.Repaint;
      end;
    end;
  end;
end;

procedure TfrPrincipal.PageControlCloseButtonMouseMove(Sender: TObject;
  Shift: TShiftState; X, Y: Integer);
var
  pagecontrol: TPageControl;
  Inside: Boolean;
begin
  pagecontrol := Sender as TPageControl;

  if (ssLeft in Shift) and (FCloseButtonMouseDownIndex >= 0) then
  begin
    Inside := PtInRect(FCloseButtonsRect[FCloseButtonMouseDownIndex],
      Point(X, Y));

    if FCloseButtonShowPushed <> Inside then
    begin
      FCloseButtonShowPushed := Inside;
      pagecontrol.Repaint;
    end;
  end;
end;

procedure TfrPrincipal.PageControlCloseButtonMouseLeave(Sender: TObject);

var
  pagecontrol: TPageControl;
begin
  pagecontrol := Sender as TPageControl;
  FCloseButtonShowPushed := False;
  pagecontrol.Repaint;
end;

procedure TfrPrincipal.PageControlCloseButtonMouseUp(Sender: TObject;
  Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
  pagecontrol: TPageControl;
begin
  pagecontrol := Sender as TPageControl;

  if (Button = mbLeft) and (FCloseButtonMouseDownIndex >= 0) then
  begin
    if PtInRect(FCloseButtonsRect[FCloseButtonMouseDownIndex], Point(X, Y)) then
    begin
    //  ShowMessage('Boton ' + IntToStr(FCloseButtonMouseDownIndex + 1) +
     //   ' Precionado!');
      PageControlCloseButton.ActivePage.Free;
      FCloseButtonMouseDownIndex := -1;
      pagecontrol.Repaint;
      frmCliente.Close;
    end;
  end;
end;

el asunto es que yo creo un formulario utilizando el pagecontrol como parent de mi formulario sin embargo si llamo a otro formulario se pone en cima del anterior. y al final si cambio de pestaña se borran. pongo mi ejemplo para que alguien me de una posible solución a como manejar este comportamiento indeseado


Saludos

novato_erick

nota: adjunto archivo.