title: How to send AJAX Request only if store size is 0
body: <p>How to send AJAX request for combo box by having condition that current store size is 0.</p>
  
  <p>Basically I have two remote combo box which are cascaded and both are lazily loaded ( This behaviour cannot be changed)</p>
  
  <p>I found even if the second combo box is cascaded based on events in first combobox upoun expansion it makes AJAX call to server ( Only first expansion though)</p>
  
  <p>querymode local and autoload option will not work as it load the combo box on page load when store is created.</p>
  
  <p>Given below is code snippet.</p>
  
  <pre><code>  xtype: 'combo',id='firstcombo', name: 'DEFAULT_VALUE' ,minChars:2, value: decodeHtmlContent('') ,width:200 ,listWidth:500, resizable: true,
   valueField : 'id', displayField: 'id', pageSize: 15,forceSelection:true, enableKeyEvents: true,
   store: new Ext.data.Store({reader: new Ext.data.CFQueryReader({id: 'NAME', 
              fields:[{name:'id', mapping:'id'}]}), 
              fields: [{name:'id', mapping:'id'}], 
              url:'server/ajax/Params'
              }
  
   }),
   listeners : {
           select:function(combo, record, index) {
              this.setRawValue(decodeHtmlContent(record.get('id')));
              cascadeFields();
          }
  
  
  
   xtype: 'combo',id='secondcombo', name: 'DEFAULT_VALUE' ,minChars:2, value: decodeHtmlContent('') ,width:200 ,listWidth:500, resizable: true,
   valueField : 'id', displayField: 'id', pageSize: 15,forceSelection:true, enableKeyEvents: true,
   store: new Ext.data.Store({reader: new Ext.data.CFQueryReader({id: 'NAME', 
              fields:[{name:'id', mapping:'id'}]}), 
              fields: [{name:'id', mapping:'id'}], 
              url:'server/ajax/Params',
              baseParam:{valuefirst:''}
              },
              listeners: {
  
                  beforeload: function(store, options) {
                      var value = Ext.getCmp('fistcombo').value;
                      Ext.apply(options.params, {
  
                                  valuefirst:value
                              });
  
  
                  }, 
  
   }),
   listeners : {
           select:function(combo, record, index) {
              this.setRawValue(decodeHtmlContent(record.get('id')));
          }
  
  
  function cascadeFields()
  {
  
    var combo = Ext.getCmp('secondcombo');
  
    if(combo.store)
    {
  
    var store = combo.store;
  
  
    combo.setDisabled(true);
    combo.clearValue('');
    combo.store.removeAll();
    combo.store.load();        
    combo.setDisabled(false);
  
    }
  }
  </code></pre>