code: private void setSelectPositionY(int posY, int height) {
  
          m_markerStyle.setTop(posY, Unit.PX);
          m_markerStyle.setHeight(height, Unit.PX);
  
          m_overlayTopStyle.setHeight(posY, Unit.PX);
          m_overlayBottomStyle.setHeight(m_elementHeight - posY - height, Unit.PX);
  
          m_currentSelection.setTop(posY);
          m_currentSelection.setHeight(height);
      }
docs: Sets Y position and height of the select area.<p>
  
  @param posY the new Y position
  @param height the new height