protected void uncheck(){
  checkmark.setAttribute(SVGConstants.SVG_STYLE_ATTRIBUTE,SVGConstants.CSS_DISPLAY_PROPERTY + ":" + SVGConstants.CSS_NONE_VALUE);
  checked=false;
  fireSwitchEvent(new ChangeEvent(SVGCheckbox.this));
}

protected void uncheck ( ) { checkmark . setAttribute ( SVGConstants . SVG_STYLE_ATTRIBUTE , SVGConstants . CSS_DISPLAY_PROPERTY + ":" + SVGConstants . CSS_NONE_VALUE ) ; checked = false ; fireSwitchEvent ( new ChangeEvent ( SVGCheckbox . this ) ) ; }
remove the checkmark and fire the event .
