code: void writeAddHandler(IndentedWriter writer, FieldManager fieldManager,
  			String handlerVarName, String addHandlerMethodName,
  			String objectName) {
  		if (useLazyWidgetBuilders) {
  			fieldManager.require(objectName).addStatement("%1$s.%2$s(%3$s);",
  					objectName, addHandlerMethodName, handlerVarName);
  		} else {
  			writer.write("%1$s.%2$s(%3$s);", objectName, addHandlerMethodName,
  					handlerVarName);
  		}
  	}
docs: Adds the created handler to the given object (field).
  
  @param writer
  the writer used to output the results
  @param handlerVarName
  the name of the handler variable
  @param addHandlerMethodName
  the "add handler" method name associated with the object
  @param objectName
  the name of the object we want to tie the handler