title: Reset errors in Knockout validation in step-by-step wizard
body: <p>I have created a step by step wizard using knockout and the template bind and now I want to force the user to complete each page before going to next, and by completing I mean Knockout validate must be valid. 
  The next-button is enabled when there is no error on the viewmodel and it works fine when stepping through the wizard but the problem occurs when you go into one step and press previous. The errors kept "alive" even when you go back, so the next-button on page 1 are disabled because page 2 are invalid.</p>
  
  <p>I've setup a fiddle: <a href="http://jsfiddle.net/1uo8rtw2/1/" rel="nofollow">http://jsfiddle.net/1uo8rtw2/1/</a></p>
  
  <ol>
  <li>Write something in the name box</li>
  <li>Press next</li>
  <li>Press previous</li>
  <li>Now you see the Next-button is disabled. </li>
  </ol>
  
  <p>Is suppose the problem is in the code below:</p>
  
  <pre><code>    self.errors = ko.validation.group(self.viewModel);
  
      self.PrevIsEnabled = ko.observable(false);
      self.NextIsEnabled = ko.computed(function() {
          return self.errors().length == 0 &amp;&amp; self.SelectedTemplate() != "Age";
      });
  </code></pre>
  
  <p>Is there any way one can reset error-count when going back and force knockout validation to re-validate the current template?</p>