Allows you to set the error text of the wizard.

	// C#
	// Creates a simple Wizard window and prints an error 
	// string until you set the number to 5
	
	using UnityEngine;
	using UnityEditor;
	
	public class ErrorString : ScriptableWizard {
		public int number = 0;
		[MenuItem ("Example/Show Error String")]
		static void CreateWindow() {
			ScriptableWizard.DisplayWizard("Error String example", typeof(ErrorString), "Close");	
		}
		void OnWizardUpdate() {
			helpString = "Set The number to 5";
			if(number != 5)
				errorString = "The number has to be set to 5!";
			else
				errorString = "";	
		}
	}