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type
  TMyKompo= class(TPanel)
  private
    FOnPaint        :TNotifyEvent;
//...
  protected
    procedure Paint; override;
//...

procedure TMyKompo.Paint;
begin

  inherited;
  if assigned(fOnPaint)
   then fOnPaint(Self);

end;                    

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type
   TMyPanel = class(TCustomPanel)
   private
      { Private-Deklarationen }
      iFrameColor: tcolor;
   protected
      { Protected-Deklarationen }
      procedure Paint;
                override;
   public
      { Public-Deklarationen }
      property DockManager;

      constructor Create(AOwner: TComponent);
                  reintroduce; override;
   published
      property Align;
      property Alignment;
      property Anchors;
      property AutoSize;
      property BevelInner;
      property BevelOuter;
      property BevelWidth;
      property BiDiMode;
      property BorderWidth;
      property BorderStyle;
      property Caption;
      property Color;
      property Constraints;
      property Ctl3D;
      property UseDockManager default True;
      property DockSite;
      property DragCursor;
      property DragKind;
      property DragMode;
      property Enabled;
      property FullRepaint;
      property Font;
      property Locked;
      property ParentBiDiMode;
      property ParentBackground;
      property ParentColor;
      property ParentCtl3D;
      property ParentFont;
      property ParentShowHint;
      property PopupMenu;
      property ShowHint;
      property TabOrder;
      property TabStop;
      property Visible;
      property OnCanResize;
      property OnClick;
      property OnConstrainedResize;
      property OnContextPopup;
      property OnDockDrop;
      property OnDockOver;
      property OnDblClick;
      property OnDragDrop;
      property OnDragOver;
      property OnEndDock;
      property OnEndDrag;
      property OnEnter;
      property OnExit;
      property OnGetSiteInfo;
      property OnMouseDown;
      property OnMouseMove;
      property OnMouseUp;
      property OnResize;
      property OnStartDock;
      property OnStartDrag;
      property OnUnDock;
      { Published-Deklarationen }
      property FrameColor: tcolor
               read iFrameColor
               write iFrameColor;

   end;

implementation

constructor TMyPanel.create(AOwner: TComponent);
begin
   inherited create(AOwner);
   Height := 44;
   Width := 120;
   iFrameColor := clBtnShadow;
end;

procedure TMyPanel.paint;
const
   aiAlignments: array[talignment] of integer = (DT_LEFT, DT_RIGHT, DT_CENTER);
var
   recRect: trect;
   iTopColor: tcolor;
   iBottomColor: tcolor;
   iFontHeight: integer;
   iFlags: integer;

   procedure adjust_colors(Bevel: TPanelBevel);
   begin
      iTopColor := clWhite;
      if Bevel = bvLowered then
         iTopColor := iFrameColor;
      iBottomColor := iFrameColor;
      if Bevel = bvLowered then
         iBottomColor := clWhite;
   end;

begin
   recRect := GetClientRect;
   if BevelOuter <> bvNone then
   begin
      adjust_colors(BevelOuter);
      Frame3D(Canvas, recRect, iTopColor, iBottomColor, BevelWidth);
   end;
   Frame3D(Canvas, recRect, Color, Color, BorderWidth);
   if BevelInner <> bvNone then
   begin
      adjust_colors(BevelInner);
      Frame3D(Canvas, recRect, iTopColor, iBottomColor, BevelWidth);
   end;
   Canvas.Brush.Color := Color;
   Canvas.fillrect(recRect);
   Canvas.Brush.Style := bsClear;
   Canvas.Font := Self.Font;
   iFontHeight := Canvas.textheight('W');
   recRect.Top := ((recRect.Bottom + recRect.Top) - iFontHeight) div 2;
   recRect.Bottom := recRect.Top + iFontHeight;
   iFlags := DT_EXPANDTABS or DT_VCENTER or aiAlignments[Alignment];
   iFlags := DrawTextBiDiModeFlags(iFlags);
   drawtext(Canvas.Handle, pchar(Caption), -1, recRect, iFlags);
end;