code: public Object getComponent(int iPosition)
      {
          if (m_vScreenField == null)
              return null;
          if (iPosition < m_vScreenField.size())
          {
              try   {
                  return m_vScreenField.elementAt(iPosition);
              }
              catch (ArrayIndexOutOfBoundsException e)    {
                  return null;
              }
          }
          return null;
      }
docs: Get the component at this position.
  @return The component at this position or null.