동적으로 View 변경하기

refs: [
        {
            ref :  'contentPanel',
            selector: 'ContentPanel'
        }
]

var contentPanel = this.getContentPanel();
contentPanel .removeAll(); //removing existing views.

var usersGrid = Ext.create('MyApp.view.Content.UsersGrid');

contentPanel.add(usersGrid);
contentPanel.doLayout();