CPoint pt ;
::GetCursorPos(&pt);
HWND hdl = ::WindowFromPoint(pt);
CWnd* pwnd = CWnd::FromHandle(hdl);
pwnd->ScreenToClient(&pt);
pwnd->SendMessage(WM_LBUTTONDBLCLK,0, MAKELONG(pt.x, pt.y));
CPoint pt ;
::GetCursorPos(&pt);
HWND hdl = ::WindowFromPoint(pt);
CWnd* pwnd = CWnd::FromHandle(hdl);
pwnd->ScreenToClient(&pt);
pwnd->SendMessage(WM_LBUTTONDBLCLK,0, MAKELONG(pt.x, pt.y));