title: Extjs Set value to end timefield with respect to input in start timefield
body: <p>I have a question.
  I have 2 timeFields in my form, startTime and endTime. On selection of time from startTime I need the endTime to be filled with a value which is 2 hrs greater than the selected value in startTime field. 
  Can anyone help me out.
  I'm using ext 4.2 and sencha architect.</p>
  
  <pre><code>var win = this.getRfRWindow();
             var form = win.down('form');
             var startTime = win.down('form').down('timefield[name=sTime]');
             var endTime = win.down('form').down('timefield[name=eTime]');
             endTime.clearValue();
             endTime.setMinValue(startTime.getValue());
  </code></pre>
  
  <p>And I know this is how to set minValue.</p>