code: public void setCustomOnColor(final CustomColorDef CUSTOM_ON_COLOR) {
          customOnColor = CUSTOM_ON_COLOR;
          init(getInnerBounds().width, getInnerBounds().height);
          repaint(getInnerBounds());
      }
docs: Sets the custom color definition that will be used to visualize the on state of the symbol
  @param CUSTOM_ON_COLOR