Передвижение кнопки по экрану?

#include "afxwin.h"      
#define IDC_MYBUTTON 100  
 
class CMyApp : public CWinApp {  
public: 
 CMyApp();    
  virtual BOOL InitInstance(); 
}; 
 
class CMyButton: public CButton  
{ 
public: 
 afx_msg void OnLButtonDown(UINT, CPoint); 
 afx_msg void OnRButtonDown(UINT, CPoint); 
private: 
 DECLARE_MESSAGE_MAP(); 
}; 
void CMyButton::OnLButtonDown(UINT, CPoint) 
{ 
  MoveWindow(500, 500, 100, 30); 
} 
 
void CMyButton::OnRButtonDown(UINT, CPoint) 
{ 
  MoveWindow(0, 0, 100, 30); 
} 
 
BEGIN_MESSAGE_MAP(CMyButton, CButton)  
 ON_WM_LBUTTONDOWN() 
 ON_WM_RBUTTONDOWN() 
END_MESSAGE_MAP() 
 
 
class CMainWnd : public CFrameWnd 
{ 
public: 
 
 CMainWnd();     //Конструктор 
 ~CMainWnd();     //Деструктор 
private: 
CMyButton* MyButton;   
}; 
 
 
CMainWnd::CMainWnd() 
{ 
Create(NULL,"Окно приложения пользователя", WS_OVERLAPPEDWINDOW, 
rectDefault, NULL, NULL);    
 MyButton = new CMyButton(); 
  if (MyButton!=NULL)  
  MyButton->Create("Button", WS_CHILD|WS_VISIBLE|SS_CENTER,
  CRect(0, 0, 100, 30), this, IDC_MYBUTTON); 
}  
CMainWnd::~CMainWnd()     
{ 
 
  if (MyButton != NULL) delete MyButton;   
  
} 
 
CMyApp::CMyApp()     
{} 
 
BOOL CMyApp::InitInstance()     
{ 
 m_pMainWnd=new CMainWnd();   
 ASSERT(m_pMainWnd);    
 m_pMainWnd->ShowWindow(SW_SHOW);  
 m_pMainWnd->UpdateWindow();  
  return TRUE;     
}; 
CMyApp theApp;