I define a window include a form and some field and combo box. Example like

```
    Ext.define('Ext.example.ABC', {
        extend: 'Ext.window.Window',   
        items:{
            xtype:'form',
            items:[
            {
            xtype: 'combo',
            id: 'example',
            name: 'ax',
            triggerAction:  'all',
            forceSelection: true,
            editable:       false,
            allowBlank: false,
            fieldLabel:     'example',
            mode: 'remote',
            displayField:'name',
            valueField: 'id',
            store: Ext.create('Ext.data.Store', {
                            fields: [
                                {name: 'id'},
                                {name: 'name'}
                            ],
                            autoLoad: true,
                            proxy: {
                                type: 'ajax',
                                url: 'example.php',
                                reader: {
                                    type: 'json',
                                    root: 'rows'
                                }
                            }
                }
            })
            }]
         }
         ,load: function(a) {
              // do some thing
         }
});

```

And I have a button in a **grid panel** 

```
tbar:[
        {    
            text:'create',
            handler:function(){
                         var x = new Ext.example.ABC();
                 x.load(0);

            }
        }

```

But Why when i just start gridpanel then combo also load while I have not click button **create**.

 I have many combo box and that make my grid panel load slowly :(

 How can i fix that thanks