组件定制的简单有关问题，大家来看看

组件定制的简单问题，大家来看看。
我已经了解并实践了自定义组件的开发，不过都是继承自一个其他基本组件的，现在我想实现一个组件比如是一个文本框前面一个Label,后面一个Button，就是说三个组件合成一个组件，大家给个思路。
我试者先继承一个edit，然后在构造的时候创建label和button，设定Parent,可是好像不成功，label和button不会显示。各位能人指教下，谢了。

------解决方案--------------------
type
TmyControl=class(TWinControl)
private
FLabel:TLabel;
FEdit:TEdit;
FButton:TButton;
public
constructor Create;override;
destructor Destroy; override;
end;

------解决方案--------------------
可参考D7控件TCustomLabeledEdit源码，在ExtCtrls.pas文件中。
对于“我已经了解并实践了自定义组件的开发，不过都是继承自一个其他基本组件的”的说法是不正确的。
------解决方案--------------------
FLabel:TLabel;
FEdit:TEdit;
FButton:TButton;
加为私有
------解决方案--------------------
TCustomLabeledEdit = class(TCustomEdit)
private
FEditLabel: TBoundLabel;
FLabelPosition: TLabelPosition;
FLabelSpacing: Integer;
procedure SetLabelPosition(const Value: TLabelPosition);
procedure SetLabelSpacing(const Value: Integer);
protected
procedure SetParent(AParent: TWinControl); override;
procedure Notification(AComponent: TComponent; Operation: TOperation); override;
procedure SetName(const Value: TComponentName); override;
procedure CMVisiblechanged(var Message: TMessage);
message CM_VISIBLECHANGED;
procedure CMEnabledchanged(var Message: TMessage);
message CM_ENABLEDCHANGED;
procedure CMBidimodechanged(var Message: TMessage);
message CM_BIDIMODECHANGED;
public
{ Public declarations }
constructor Create(AOwner: TComponent); override;
procedure SetBounds(ALeft: Integer; ATop: Integer; AWidth: Integer; AHeight: Integer); override;
procedure SetupInternalLabel;
property EditLabel: TBoundLabel read FEditLabel;
property LabelPosition: TLabelPosition read FLabelPosition write SetLabelPosition;
property LabelSpacing: Integer read FLabelSpacing write SetLabelSpacing;
end;
....
....
{ TCustomLabeledEdit }

constructor TCustomLabeledEdit.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FLabelPosition := lpAbove;
FLabelSpacing := 3;
SetupInternalLabel;
end;

procedure TCustomLabeledEdit.CMBidimodechanged(var Message: TMessage);
begin
inherited;
FEditLabel.BiDiMode := BiDiMode;
end;

procedure TCustomLabeledEdit.CMEnabledchanged(var Message: TMessage);
begin
inherited;
FEditLabel.Enabled := Enabled;
end;

procedure TCustomLabeledEdit.CMVisiblechanged(var Message: TMessage);
begin
inherited;
FEditLabel.Visible := Visible;
end;

procedure TCustomLabeledEdit.Notification(AComponent: TComponent;
Operation: TOperation);
begin
inherited Notification(AComponent, Operation);
if (AComponent = FEditLabel) and (Operation = opRemove) then
FEditLabel := nil;
end;

procedure TCustomLabeledEdit.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
begin
inherited SetBounds(ALeft, ATop, AWidth, AHeight);
SetLabelPosition(FLabelPosition);
end;

procedure TCustomLabeledEdit.SetLabelPosition(const Value: TLabelPosition);
var
P: TPoint;
begin
if FEditLabel = nil then exit;
FLabelPosition := Value;
case Value of
lpAbove: P := Point(Left, Top - FEditLabel.Height - FLabelSpacing);
lpBelow: P := Point(Left, Top + Height + FLabelSpacing);