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  TAppAlive=class(TWinControl)
   constructor Create(AOwner:TComponent); override;
   destructor Destroy; override;
  protected
   procedure SetParent(AParent:TWinControl); override;
   procedure SetEnabled(NewValue:boolean); override;
  public
   procedure SetBounds(ALeft,ATop,AWidth,AHeight:integer); override;
   procedure Update; override;
  private
   Thread:TDoWhat;
   FBeam:TBitmap;
   procedure SetBeam(NewBeam:TBitmap);
  published
   property Beam:TBitmap read FBeam write SetBeam;
   property Enabled:boolean write SetEnabled;
  end;
.
.
.
procedure TAppAlive.SetBeam(NewBeam:Graphics.TBitmap);
begin
 FBeam.Assign(NewBeam);
 ShowMessage('Hallo');
 SetBounds(Left,Top,Width,Height);
 if Assigned(Thread) then Thread.SetBeam(FBeam);
end;