title: How to use ko.validation.group function
body: <p>I am trying to use knockout.validation plugin. I created an exampleViewModel :</p>
  
  <pre><code>function exampleViewModel() {
     this.P1 = ko.observable().extend({ required : true });
     this.P2 = ko.observable().extend({ required : true });
     this.P3 = ko.observable().extend({ required : true });
     this.P4 = ko.observable().extend({ required : true });
  
     this.errors = ko.validation.group(this);
  }    
  </code></pre>
  
  <p>In the above view model i created a validation group named errors for the current object. Now if any validation rule fails on any 1 property out of 4 than this errors property contains an error message.</p>
  
  <p><code>My question is</code> , if i want to create a validation group of only 3 properties <code>(P1, P2, P3)</code> out of 4 than how can i do this ?</p>