#ifndef __MYCTROLTRL_H__
  #define __MYCTROLTRL_H__
  #define MYWNDCLASS "mycontrol"
  #include <afxtempl.h>
  class CMycontrol: public CWnd
  {
   private:
   public:
   static BOOL RegisterWndClass();
   CMycontrol();
   void customfun();//一個自定義方法
   };
  #endif

#include "StdAfx.h"
  #include "mycontrol.h"
  CMycontrol::CMycontrol()
  {
 CMycontrol::RegisterWndClass();
  }
  //注冊控件RegisterWndClass格式是固定的不要記憶沒有那個必要直接拷貝粘貼就可以。 
  CMycontrol::RegisterWndClass()
  {
  WNDCLASS windowclass;
  HINSTANCE hInst = AfxGetInstanceHandle();
  //Check weather the class is registerd already
  if (!(::GetClassInfo(hInst, MYWNDCLASS, &windowclass)))
  {
    //If not then we have to register the new class
    windowclass.style = CS_DBLCLKS;// | CS_HREDRAW | CS_VREDRAW;
    windowclass.lpfnWndProc = ::DefWindowProc;
    windowclass.cbClsExtra = windowclass.cbWndExtra = 0;
    windowclass.hInstance = hInst;
    windowclass.hIcon = NULL;
    windowclass.hCursor = AfxGetApp()->LoadStandardCursor(IDC_ARROW);
    windowclass.hbrBackground = ::GetSysColorBrush(COLOR_WINDOW);
    windowclass.lpszMenuName = NULL;
    windowclass.lpszClassName = MYWNDCLASS;
    if (!AfxRegisterClass(&windowclass))
    {
      AfxThrowResourceException();
      return FALSE;
    }
  } 
  return TRUE;
 }
 //自定義方法
 void CMycontrol::customfun()
 {
 AfxMessageBox(_T("my control!"));
 }

void CCustomcontrolDlg::OnButton1()
  {
 // TODO: Add your control notification handler code here
   m_mycontrol.customfun(); 
 }