title: dojo1.8 - unable to refresh the input text box of ComboBox when memory updated
body: <p>dijit/form/ComboBox is a hybrid of a select element and a textbox.
  I have:-
  A select for 3 options for 3 memories
  A ComboBox to be populated with selected memory each time select on "changed"
  The item can be choosed in the ComboBox.
  Again memory is selected and populated in ComboBox </p>
  
  <p>All seem Ok but...
  The ComoBox's textbox cannot be updated to reflect the change in memory. Or even it cannot be set to blank one.
  I tried using value:""; or placeHolder:""; but to no avail.</p>
  
  <pre><code>meter_Select.on('change', function()
              {
                  //registry.byId('batchSelect').destroyrescursive();
                  console.debug("selected -&gt; " + meter_Select.value);
                  switch(meter_Select.value)
                  {
                      case 'testdata1970_05': var memoStore2 =  new Memory({data:response2});
                      break;
                      case 'testdata1970_10': var memoStore2 =  new Memory({data:response3});
                      break;
                      case 'testdata2060_03': var memoStore2 =  new Memory({data:response1});
                  }
  
                  //memoStore2.put({"mfg_code":""});// it works but it needs to be moved to the top!
  
                  var combx = registry.byId('cardSelect');// at first it will be undefined
                  console.debug('ComboBox Select(1A) ='+combx);
  
                  if(combx)//if combx exists or already defined
                  {
                      combx.store = memoStore2;
                      combx.value = "";
                      combx.placeHolder = "Choose one of the batch...";
                      //combx.domAttr.set('cardSelect','displayedValue','');
                      console.debug('ComboBox Select(1C) ='+combx);
                      //domAttr.set('batchSelect','store','nemoStore2');
                  } 
                  else
                  {// if combx does not exist or is not defined yet
                      combx = new ComboBox({
                      id: 'cardSelect',
                      store: memoStore2,
                      searchAttr: "mfg_code",
                      value :"",
                      placeHolder: "Choose one of the batch..."
                      }, "node_cardSelect");
                      console.debug('ComboBox Select(1B) ='+combx);
                  }
  
                  combx.startup();
  </code></pre>
  
  <p>You can check out at <a href="http://jsfiddle.net/clementyap/9tNhN/33/" rel="nofollow">jsFiddle Link</a>
  Please advise. Thanks in advance</p>