How to set validation false to form from listener

Hi, I have some from and some textfield on it:

TextField taxNumber = new TextField();
				.withValidator(new StringLengthValidator(....

And I have some validation logic in Listener:

taxNumber.addBlurListener(event -> {
			String localResult = "";

				InfoResult ir = ks.loadInfo(taxNumber.getValue()); 
				if ((ir.errorText == null) && (! { 
				} else {
					localResult = "";
					taxNumber.setErrorMessage("Not valid tax - " + accountApplicationBinder.isValid());

And I want to get behavior like a “.withValidator… return not valid” in my submit button listener. Another words: i want to have my submit button not working then taxNumber.addBlurListener return not valid result. How I can do it???