Как сделать System.Windows.Forms.Panel прозрачной

{$apptype windows}
{$reference 'System.Windows.Forms.dll'}
{$reference 'System.Drawing.dll'}
 
uses
  System.Windows.Forms,
  System.Drawing;
  
var
  MainForm: Form;
  P: Panel;
  
begin
  P := new Panel;
  P.BackColor := Color.Crimson; {Закрашиваем панель "левым цветом"}
  
  MainForm := new Form;
  MainForm.TransparencyKey := Color.Crimson; {Задаём цвет отображаемый прозрачным на форме.}
  
  MainForm.Controls.Add(P);
  
  Application.Run(MainForm);
end.

{$apptype windows}
{$reference 'System.Windows.Forms.dll'}
{$reference 'System.Drawing.dll'}
 
uses
  System.Windows.Forms,
  System.Drawing;
  
var
  MainForm: Form;
  P: Panel;
  g: Graphics;
  
begin
MainForm := new Form;
MainForm.TransparencyKey := Color.AliceBlue;
 
  P := new Panel;
  P.BackColor := Color.AliceBlue; 
  MainForm.Controls.Add(P);
 
  
  g:=Graphics.FromHwnd (p.Handle);
  g.DrawRectangle (new Pen (Color.Red),2,2,50,50);
  
  
  Application.Run(MainForm);
end.