title: How to customize dhtmlxscheduler.js file for adding some fields in popup?
body: <p>I have some requirement for dhtmlx scheduler, here I would like edit the event and add one text box and one button.Can you please suggest me how we can cusomize the .js(compressed) file.
  Is there any separate .js files are availble for  Development version.
  If any please suggest me.<img src="https://i.stack.imgur.com/3ju5F.png" alt="enter image description here"></p>
  
  <p>Thanks,
  Rajasekhar</p>