Change the color of a TDBEdit when its focused also using XP-Manifest component

Hi,

I want to write a custom component to that is dervied from a TDBEdit so that the color of the TDBEdit changes when it receives focus.
So far I have this:
--------------------------------------------------------------------------------------------
type
  TColorDBEdit = class(TDBEdit)
  private
    FFocusOnColor: TColor;
    FFocusOffColor: TColor;
    procedure SetFocusOnColor(Value: TColor);
    procedure SetFocusOffColor(Value: TColor);
    { Private declarations }
  protected
    { Protected declarations }
     procedure CMEnter(var Message: TCMEnter); message CM_ENTER;
     procedure CMExit(var Message: TCMExit); message CM_EXIT;
  public
    { Public declarations }
  published
    { Published declarations }
    property FocusOnColor:TColor read FFocusOnColor write SetFocusOnColor;
    property FocusOffColor:TColor read FFocusOffColor write SetFocusOffColor;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Standard', [TColorDBEdit]);
end;

{ TCMEdit }

procedure TColorDBEdit.CMEnter(var Message: TCMEnter);
begin
  inherited;

  Self.Color := FFocusOnColor;
  Self.Invalidate;
end;

procedure TColorDBEdit.CMExit(var Message: TCMExit);
begin
  inherited;

  Self.Color := FFocusOffColor;
  Self.Invalidate;
end;

procedure TColorDBEdit.SetFocusOnColor(Value: TColor);
begin
 if (FFocusOnColor <> Value) then
    FFocusOnColor := Value;
end;

procedure TColorDBEdit.SetFocusOffColor(Value: TColor);
begin
  if (FocusOffColor <> Value) then
    FFocusOffColor := Value;
end;

end.
--------------------------------------------------------------------------------------------

This code almost works, but for some reason there is a white border inside the blue (XP) border.
The white border doesn't change color until you move the mouse outside the TDBEdit.

The same thing occurs when the control looses focus. A colored border is left until you move outside the control and it returns back to white.

Is there something that I have missed with painting the control?



I'm using Delphi 7 Pro, with an XP-Manifest component on the form.

Regards,
Chris