code: public MessageMgrBuilder setHandler(E_MessageType type){
  		if(type!=null){
  			this.messageHandlers.put(type, new MessageTypeHandler(type));
  		}
  		else{
  			this.buildErrors.addError("{}: cannot add handler for empty type", this.getClass().getSimpleName());
  		}
  		return this;
  	}
docs: Activate a message type and sets a type handler with max count set to 100.
  An existing handler will be overwritten.
  @param type message type to be activated, nothing will be set if null
  @return self to allow for chaining