求教关于自定义组件的问题

[delphiaccess]

unit UrlLabel;

interface

uses
  SysUtils, Classes, Controls, StdCtrls,Graphics,ShellAPI,Windows,Messages;
type
  TUrlKind = (Html,Email,Ftp);
  TUrlLabel = class(TLabel)
  private
    FLinkUrl: string;
    FUrlKind: TUrlKind;
    FHoverColor: TColor;
    procedure SetLinkUrl(const Value: string);
    procedure SetUrlKind(const Value: TUrlKind);
    procedure SetHoverColor(const Value: TColor);
    { Private declarations }
  protected
    procedure Click;override;
    procedure MouseEnter(var Message: TMessage); message CM_MOUSEENTER;
    procedure MouseLeave(var Message: TMessage); message CM_MOUSELEAVE;
  public
    constructor Create(AOwner:TComponent);override;
  published
    property LinkUrl:string read FLinkUrl write SetLinkUrl;
    property UrlKind:TUrlKind read FUrlKind write SetUrlKind default Html;
    property HoverColor:TColor read FHoverColor write SetHoverColor default clred;
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('ttt', [TUrlLabel]);
end;
constructor TUrlLabel.Create(AOwner:TComponent);
begin
 inherited;
 Font.Color := clblue;
end;
procedure TUrlLabel.Click;
var head:string;
begin
  inherited;
  //
end;
procedure TUrlLabel.MouseEnter(var Message: TMessage);
begin
  Font.Color := HoverColor;
  Font.Style := [fsUnderLine];
  Cursor :=crHandPoint;
end;
procedure TUrlLabel.MouseLeave(var Message: TMessage);
begin
  Font.Color := clblue;
  Font.Style := Font.Style - [fsUnderLine];
  Cursor :=crDefault;
end;
procedure TUrlLabel.SetLinkUrl(const Value: string);
begin
  FLinkUrl := Value;
end;

procedure TUrlLabel.SetUrlKind(const Value: TUrlKind);
begin
  if Value = Html then
   LinkUrl := 'Http://'
  else if Value = Email then
   LinkUrl := 'MailTo:'
  else if Value = Ftp then
   LinkUrl := 'Ftp://';
  FUrlKind := Value;
end;

procedure TUrlLabel.SetHoverColor(const Value: TColor);
begin
  FHoverColor := Value;
end;

end.

1.procedure TUrlLabel.MouseEnter(var Message: TMessage);
begin
Font.Color := HoverColor;
Font.Style := [fsUnderLine]; //我这里只有这一句加下划线的代码，为什么托一个我的控件进去，就出现了下划线？我只想在鼠标移动到位置时有下划线怎么处理？
Cursor :=crHandPoint;
end;
2.procedure TUrlLabel.SetHoverColor(const Value: TColor);
begin
FHoverColor := Value;//我在设计视图的对象树中调整了FHoverColor后，发现窗口的URLLabel控件的颜色也变了，运行程序后URLLabel的颜色也成FHoverColor了，这是怎么回事？我应该怎么改呢？只想让它在鼠标移到控件上时改变颜色。
end;

[s11ss]

if not (csDesigning in ComponentState) then
...