code: public void removeAttributeBuilder(AttributeWidgetBuilder<?> builder) {
  		Iterator<AttributeWidgetBuilder<?>> iterator = builders.values().iterator();
  		while (iterator.hasNext()) {
  			AttributeWidgetBuilder<?> widgetBuilder = iterator.next();
  			if (widgetBuilder.equals(builder)) {
  				iterator.remove();
  			}
  		}
  	}
docs: Remove an attribute widget builder from the collection.
  
  @param builder the builder to remove.