I have a extjs button "Order" with menu items 'orderInsuranceMenu' for the button. I need to hide the menu items depeniding on some condition. How can i achive it

```
orderInsuranceMenu = {
    id: 'menu-order-insurance'
    ,items: [
          { 
            id:'btnMenu1',
            text: 'Test Buton1',
            iconCls: 'icon-cls',
            listeners: {
                click: function(b,e){  
                   //some code goes here
                }
            }
        }
        ,{
            id:'btnMenu2',
            text: 'Test Buton2',
            iconCls: 'icon-first-title',
            listeners: {
                click: function(b,e){  
                    //Some code here
                }
            }
        }

    ]
};

Order = new Ext.Button({
    text: 'Order&#160;'
    , iconCls: 'icon-go'
    , disabled: true
    , menu: orderInsuranceMenu
    , handler: function() {
    }

});

```

I have tried this code but it doesnt work:

Ext.getCmp('btnMenu2').hide();