Extjs Combobox remote query double loading

I have a problem with my combobox. Combobox load when i open my form panel and he get a query send by database. But when i click a trigger icon, he do the same query. I would to disable the query when i click a trigger icon.

My combobox code:

HTML Code:

xtype: 'combobox',
fieldLabel: 'Operation',
id: 'combotypeoperation',
store: 'TypeOperations',
queryMode: 'remote',
displayField: 'libelle',
editable: false,
valueField: 'idTypeOperation',
listConfig: {
         loadMask: false
},
listeners: {
         render: function() {
                 this.store.load();
        }
}                                      

TypeOperations store code:

HTML Code:

Ext.define(
        'SecureDT.store.TypeOperations',
        {
              extend: 'Ext.data.Store',
              requires: [
                'SecureDT.model.TypeOperation'
              ],
              model: 'SecureDT.model.TypeOperation',
            
              proxy: {
                       type: 'ajax',
                       timeout: 120000,
                      url: 'secureDT/typeOperation/findAll.json',
                      reader: {
                            type: 'json',
                            root: 'data'
                     }
             },
             listeners: {
                load: function() {
                    var combo = Ext.getCmp('combotypeoperation');
                    var recordSelected = combo.getStore().getAt(0).get('idTypeOperation');
                    combo.setValue(recordSelected);
                }
            }
        }
);

Extjs Combobox remote query double loading