code: public void setCustomOffColor(final CustomColorDef CUSTOM_OFF_COLOR) {
          customOffColor = CUSTOM_OFF_COLOR;
          init(getInnerBounds().width, getInnerBounds().height);
          repaint(getInnerBounds());
      }
docs: Sets the custom color definition that is used to visualize the off state of the symbol
  @param CUSTOM_OFF_COLOR