void MyGraph::Hover()
{
 if(m_bTrackingHover)
  {
   m_bTrackingHover = false;

   Point P = GetMouseViewPos();
   
   if(P == m_MousePos)
    {
     // Mouse is hovering 

     // TODO: Call ShowHint() with text
    }
  }
}

Image MyGraph::MouseEvent(int event, Point p, int zdelta, dword keyflags)
{
 switch(event)
  {
   case Ctrl::MOUSELEAVE:
     
     if(m_bTrackingHover)
      {
       m_bTrackingHover = false;
     
       KillTimeCallback(HOVER_TIMER);
      }
     else
       if(!m_pHint)
         CloseHint();
       
     break;
         
   case Ctrl::MOUSEMOVE:

     if(!m_pHint)
      {
       m_MousePos.x     = p.x;
       m_MousePos.y     = p.y;
       m_bTrackingHover = true;
     
       KillSetTimeCallback(1000, THISBACK(Hover), HOVER_TIMER);
      }
      
     break;
  }
   
 return Image::Arrow();
}