change the color of a TPageControls?

Author ：Peter Below

type

 TTabSheet = class(ComCtrls.TTabSheet)

 private

   FColor: TColor;

   procedure SetColor(Value: TColor);

   procedure WMEraseBkGnd(var Msg: TWMEraseBkGnd);

     message WM_ERASEBKGND;

 public

   constructor Create(aOwner: TComponent); override;

   property Color: TColor read FColor write SetColor;

 end;

 {...}

implementation

{...}

constructor TTabSheet.Create(aOwner: TComponent);

begin

 inherited;

 FColor := clBtnFace;

end;

procedure TTabSheet.SetColor(Value: TColor);

begin

 if FColor  Value then  

 begin

   FColor := Value;

   Invalidate;

 end;

end;

procedure TTabSheet.WMEraseBkGnd(var Msg: TWMEraseBkGnd);

begin

 if FColor = clBtnFace then

   inherited

 else  

 begin

   Brush.Color := FColor;

   Windows.FillRect(Msg.dc, ClientRect, Brush.Handle);

   Msg.Result := 1;

 end;

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

 Tabsheet1.Color := clWhite;

 TabSheet2.Color := clLime;

end;

// PageControl1.OwnerDraw := true !

procedure TForm1.PageControl1DrawTab(Control: TCustomTabControl;

 TabIndex: Integer; const Rect: TRect; Active: Boolean);

var

 AText: string;

 APoint: TPoint;

begin

 with (Control as TPageControl).Canvas do

 begin

   Brush.Color := clred;

   FillRect(Rect);

   AText := TPageControl(Control).Pages[TabIndex].Caption;

   with Control.Canvas do

   begin

     APoint.x := (Rect.Right - Rect.Left) div 2 - TextWidth(AText) div 2;

     APoint.y := (Rect.Bottom - Rect.Top) div 2 - TextHeight(AText) div 2;

     TextRect(Rect, Rect.Left + APoint.x, Rect.Top + APoint.y, AText);

   end;

 end;

end;