TObject 如何转变成 TTabControl.有例子

TObject 怎么转变成 TTabControl.有例子!
5.H代码

C/C++ code

//---------------------------------------#ifndef Unit5H#define Unit5H//---------------------------------------extern void sss(TObject *Sender);#endif

5.CPP文件代码

C/C++ code

//---------------------------------------#pragma hdrstop#include "Unit5.h"//---------------------------------------#pragma package(smart_init)void sss(TObject *Sender){     TButton *newbtn=new TButton(TTabControl *Sender);   //注意以下2行代码     newbtn->Parent = TTabControl *Sender;               //这行! TTabControl *Sender}

看到以上代码了吧! TTabControl *Sender
我以Obj 作为参数,然后我希望转换成TTAB.但是无果!

(DELphi 跟以上一样的写法是可以做到的!请问C++能不能.我知道可以void sss(TTabControl *Sender)这样写!但是我希望学到多种方法!)

错误信息
Checking project dependencies...
Compiling Project1.cbproj (Debug configuration)
[BCC32 Error] Unit5.cpp(34): E2108 Improper use of typedef 'TTabControl'
  Full parser context
  Unit5.cpp(31): parsing: void sss(TObject *)
[BCC32 Error] Unit5.cpp(35): E2108 Improper use of typedef 'TTabControl'
  Full parser context
  Unit5.cpp(31): parsing: void sss(TObject *)
Failed
Elapsed time: 00:00:00.8



[解决办法]
void sss(TObject *Sender)
{
TTabControl *tc = dynamic_cast <TTabControl *>(Sender);

TButton *newbtn = new TButton(tc);
newbtn->Parent = tc;
}

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