Как перенести функции из формы в поток

//---------------------------------------------------------------------------
 
#include <System.hpp>
#pragma hdrstop
 
#include "Unit2.h"
#include "Unit1.h"
#include <string>
#include "curl/curl.h"
 
#pragma comment(lib,"Mylib/My_curl.lib")
#pragma package(smart_init)
//---------------------------------------------------------------------------
 
//   Important: Methods and properties of objects in VCL can only be
//   used in a method called using Synchronize, for example:
//
//      Synchronize(&UpdateCaption);
//
//   where UpdateCaption could look like:
//
//      void __fastcall virtotal::UpdateCaption()
//      {
//        Form1->Caption = "Updated in a thread";
//      }
//---------------------------------------------------------------------------
int procent=0;
 
 
__fastcall virtotal::virtotal(bool CreateSuspended)
    : TThread(CreateSuspended)
{
FreeOnTerminate = true;
}
//---------------------------------------------------------------------------
 
struct myprogress {
  double lastruntime;
  CURL *curl;
};
 
/* this is how the CURLOPT_XFERINFOFUNCTION callback works */
static int xferinfo(void *p,
                    curl_off_t dltotal, curl_off_t dlnow,
                    curl_off_t ultotal, curl_off_t ulnow)
{
  struct myprogress *myp = (struct myprogress *)p;
  CURL *curl = myp->curl;
  double curtime = 0;
 
  curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &curtime);
 
   if((dlnow !=0) && (dltotal !=0))
      procent = (dlnow*100)/dltotal;
   
   //вот здесь и выдает ошибку , 
   // E2268 Call to undefined function 'Synchronize'
   Synchronize(&process);
 
  return 0;
}
 
/* for libcurl older than 7.32.0 (CURLOPT_PROGRESSFUNCTION) */
static int older_progress(void *p,
                          double dltotal, double dlnow,
                          double ultotal, double ulnow)
{
  return xferinfo(p,
                  (curl_off_t)dltotal,
                  (curl_off_t)dlnow,
                  (curl_off_t)ultotal,
                  (curl_off_t)ulnow);
}
 
void virtotal::process()
{
   Form1->Label1->Caption = procent;
}
 
 
static size_t write(char *ptr, size_t size, size_t nmemb, std::string* data)
{
  if (data)
   {
     data->append(ptr, size*nmemb);
     return size*nmemb;
   }
  else return 0;  // будет ошибка
}
 
 
int probaprogressSsaita ()
{
 
  // Открываем файлы для заголовка и тела
 
  CURL *curl;
  CURLcode res = CURLE_OK;
  struct myprogress prog;
   std::string content;
  curl = curl_easy_init();
  if(curl) {
    prog.lastruntime = 0;
    prog.curl = curl;
 
    curl_easy_setopt(curl, CURLOPT_URL, "http://aihdownload.adobe.com/bin/live/install_flashplayer15x32au_mssa_aaa_aih.exe");
 
    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, older_progress);
    /* pass the struct pointer into the progress function */
    curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, &prog);
#if LIBCURL_VERSION_NUM >= 0x072000
    curl_easy_setopt(curl, CURLOPT_XFERINFOFUNCTION, xferinfo);
    /* pass the struct pointer into the xferinfo function, note that this is
       an alias to CURLOPT_PROGRESSDATA */
    curl_easy_setopt(curl, CURLOPT_XFERINFODATA, &prog);
#endif
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &content);
    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
   //   curl_easy_setopt(curl, CURLOPT_WRITEHEADER, headerfile);
    res = curl_easy_perform(curl);
 
    if(res != CURLE_OK)
      //printf(stderr, "%s\n", curl_easy_strerror(res));
      Form1->Memo1->Lines->Add(curl_easy_strerror(res));
    /* always cleanup */
    curl_easy_cleanup(curl);
  }
  return (int)res;
}
 
 
void __fastcall virtotal::Execute()
{
    //---- Place thread code here ----
}
//---------------------------------------------------------------------------

//вот здесь и выдает ошибку , 
   // E2268 Call to undefined function 'Synchronize'
   //строка 58
   Synchronize(&process);