title: EXT JS : In Combobox, how to set a displayfield for a record which is not in the store?
body: <p>I want to set a displayfield in a combobox for a record (which is a historical data and is stored in the database and loaded on the form) which does not have an entry in the database.</p>
  
  <p>For an example, I have 3 entries in the store as below - 
  value    : display field
  a        : apple
  b        : ball
  c        : cat</p>
  
  <p>As usual,It is used to prepopulate the combobox (Working fine till here).</p>
  
  <p>I have historical data stored in the database, which has values for some records with 
  id: d, which no more exists in the store but I still want to support the old data and want to display the associated display field ('doll') with it.  </p>
  
  <p>My query is, even though this record is not in the store associated with the combobox, How can I set the display field on getting the record from the database? 
  Currently, we have no method such as setDisplayField in extJs but we have a method 'setValue' which changes the value in the combobox, and that is not desired. </p>
  
  <p>I want to change the displayfield to 'doll' on encountering 'id =d' from database.</p>
  
  <p>Please help.</p>
  
  <p>Thank you  </p>