select image area of image with ActiveX control

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VS2008

Visual-Studio

MFC

, +

I have an image and added ActiveX control on picture control.
I have added three events on ActiveX control

void CWin2Dlg::OnMouseMove(short Button, short Shift, float X, float Y)
{
}

void CWin2Dlg::LeftMouseDown(short Button, short Shift, float X, float Y)
{ 
        dimx=X;
	dimy=Y;
}

void CWin2Dlg::OnMouseLeave(short Button, short Shift, float X, float Y)
{
    CRect rc;
    GetClientRect(&rc);//GetWindowRect
    PicpStatic=new CStatic();
    CRect rcClient=new CRect(dimx,dimy,X,Y);
    PicpStatic->Create("",WS_CHILD|WS_VISIBLE|SS_BITMAP,rcClient,this,50);
    PicpStatic->ShowWindow(SW_HIDE);
}

All three events are working fine.
But I want to know how can I select image area(e.i. crop image)