code: public void setArea3DEffectVisible(final boolean AREA_3DEFFECT_VISIBLE) {
          area3DEffectVisible = AREA_3DEFFECT_VISIBLE;
          init(getInnerBounds().width, getInnerBounds().height);
          repaint(getInnerBounds());
      }
docs: Enables / disables the visibility of the 3d effect gradient overlay for the areas
  @param AREA_3DEFFECT_VISIBLE