...show controls with rounded corners?

 https://www.swissdelphicenter.ch/en/showcode.php?id=921

 www.teamb.com

 Autor: P. Below
Homepage: http://www.teamb.com
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procedure MakeRounded(Control: TWinControl);
var
  R: TRect;
  Rgn: HRGN;
begin
  with Control do
  begin
    R := ClientRect;
    rgn := CreateRoundRectRgn(R.Left, R.Top, R.Right, R.Bottom, 20, 20);
    Perform(EM_GETRECT, 0, lParam(@r));
    InflateRect(r, - 5, - 5);
    Perform(EM_SETRECTNP, 0, lParam(@r));
    SetWindowRgn(Handle, rgn, True);
    Invalidate;
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  // TMemo:
  Memo1.BorderStyle := bsNone;
  MakeRounded(Memo1);
  // TEdit:
  Edit2.BorderStyle := bsNone;
  MakeRounded(Edit2);
  // TPanel:
  MakeRounded(Panel1);
  // TStaticText:
  MakeRounded(StaticText1);
  // TForm
  Form1.BorderStyle := bsNone;
  MakeRounded(Form1);
end;

Vcl.ExtCtrls.TShape corner size of RoundRect

FMX.StdCtrls.TCornerButton

https://stackoverflow.com/questions/11675374/how-to-make-tframe-with-rounded-corners

  TCustomRoundShape = class(TGraphicControl)

procedure TForm1.FormPaint(Sender: TObject);
const
  n = 50;
var
  Rgn: HRGN;
  x1,y1,x2,y2: Integer;
begin
  x1 := n;
  y1 := n div 2;
  x2 := ClientWidth - n;
  y2 := ClientHeight - n;
 
  Rgn := CreateRoundRectRgn(x1, y1, x2, y2, n, n);
 
  Canvas.Brush.Color := clSilver;
  Canvas.Brush.Style := bsCross;
  FillRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle);
 
  Canvas.Brush.Color := clRed;
  Canvas.Brush.Style := bsSolid;
  FrameRgn(Canvas.Handle, Rgn, Canvas.Brush.Handle, 2, 2);

  DeleteObject(Rgn);
end;

 https://stackoverflow.com/questions/11675374/how-to-make-tframe-with-rounded-corners
https://stackoverflow.com/questions/5755719/rounded-and-titled-tpanel-in-delphi-7
https://stackoverflow.com/questions/32987649/how-to-create-a-user-control-with-rounded-corners

...create a form with rounded corners?
Autor: Horst Kniebusch
Homepage: http://members.tripod.de/Kniebusch
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{
  Die CreateRoundRectRgn lässt eine Form mit abgerundeten Ecken erscheinen.

  The CreateRoundRectRgn function creates a rectangular
  region with rounded corners
}

procedure TForm1.FormCreate(Sender: TObject);
var
  rgn: HRGN;
begin
  Form1.Borderstyle := bsNone;
  rgn := CreateRoundRectRgn(0,// x-coordinate of the region's upper-left corner
    0,            // y-coordinate of the region's upper-left corner
    ClientWidth,  // x-coordinate of the region's lower-right corner
    ClientHeight, // y-coordinate of the region's lower-right corner
    40,           // height of ellipse for rounded corners
    40);          // width of ellipse for rounded corners
  SetWindowRgn(Handle, rgn, True);
end


{ The CreatePolygonRgn function creates a polygonal region. }


procedure TForm1.FormCreate(Sender: TObject);
const
  C = 20;
var
  Points: array [0..7] of TPoint;
  h, w: Integer;
begin
  h := Form1.Height;
  w := Form1.Width;
  Points[0].X := C;     Points[0].Y := 0;
  Points[1].X := 0;     Points[1].Y := C;
  Points[2].X := 0;     Points[2].Y := h - c;
  Points[3].X := C;     Points[3].Y := h;

  Points[4].X := w - c; Points[4].Y := h;
  Points[5].X := w;     Points[5].Y := h - c;

  Points[6].X := w;     Points[6].Y := C;
  Points[7].X := w - C; Points[7].Y := 0;

  SetWindowRgn(Form1.Handle, CreatePolygonRgn(Points, 8, WINDING), True);
end;