title: How to set isDirty() value dynamically in Ext Js
body: <p>how to set isDirty() value dynamically in Ext Js</p>
  
  <p>I have form panel which contains textbox, radio buttons and save button. In afterrender function i am setting a value to textbox . after loading the page the isDirty() is returning true, but my requirement is when I click on update button only it should return true.  </p>
  
  <p>how I can achieve this. </p>
  
  <p>I tried with trackResetOnLoad= true but its not working.</p>
  
  <p>Fiddle example is 
  <a href="https://fiddle.sencha.com/#fiddle/1d74" rel="nofollow">https://fiddle.sencha.com/#fiddle/1d74</a></p>
  
  <p>Update:-
  I need track Change or update  after Afterrender function.</p>