How to handle Mouse movement/ Draw a rectangle within CStatic/Picture box

Hello,

I have a picture box, in which I need to draw a rectangle when user
makes a selection by dragging the mouse.

I am able to capture the mouse click event in the picture box(by
deriving from CStatic and handled the
ON_STN_CLICKED event from main Form).

But I am unable to understand how to capture mouse drag/ draw a
rectangle over picture box when the mouse moves. (New to MFC
programming, Pls help, any tips on how to handle OnLButtonUp,
OnMouseMove events for CStatic controls!) I really appreciate any
help.


Heres the code of what I have right now:

CpictureBox.h
------------------------------------------------------------------------------------------------------
class CPictureBox : public CStatic
{
       DECLARE_DYNAMIC(CPictureBox)

public:
       CPictureBox();
       virtual ~CPictureBox();
       void SetBitmap(CString strBitmap);
protected:
               afx_msg void OnPaint();
               void ShowBitmap(CPaintDC *pDC);
               CString m_sBitmap;
               CBitmap m_bmpBitmap;
               BITMAP bm;
               CRect m_Rect;

       DECLARE_MESSAGE_MAP()
};

void CPictureBox::OnLButtonDown(UINT nFlags, CPoint point)
{
  m_Tracking = TRUE;
  SetCapture();
  m_Rect.right = m_Rect.left = point.x;
  m_Rect.bottom = m_Rect.top = point.y;
  Invalidate();
  CStatic::OnLButtonDown(nFlags, point);

}

------------------------------------------------------------------------------------------------------

CPictureBox.cpp -- These dont get the control when events are fired!

----------------------------------------------------------------------------------------------------
void CPictureBox::OnMouseMove(UINT nFlags, CPoint point)
{
  if (m_Tracking)
  {
     m_Rect.right = point.x;
     m_Rect.bottom = point.y;
     Invalidate();
  }

  CStatic::OnMouseMove(nFlags, point);
}

----------------------------
Main Dialog.cpp--
-----------------
BEGIN_MESSAGE_MAP(CmfcThsProj1Dlg, CDialog)
       ON_WM_SYSCOMMAND()
       ON_WM_PAINT()
       ON_WM_QUERYDRAGICON()
       //}}AFX_MSG_MAP
       ON_BN_CLICKED(IDC_BTN_BROWSE, OnBnClickedBtnBrowse)
       ON_WM_MOUSEMOVE()
       ON_STN_CLICKED(IDC_STATIC_PICBOX, OnStnClickedStaticPicbox)
END_MESSAGE_MAP()


void CmfcThsProj1Dlg::OnStnClickedStaticPicbox()
{
       // TODO: Add your control notification handler code here
       MessageBox("hello world");
       //CPictureBox::OnLButtonUp
       //m_PictureBox.Invalidate();
}

----------------------------------------------------------

-Thanks