Close a window

Hello,

How can i close a window ?

I use a button with handler but i have an error :

TypeError: bindings[key].destroy is not a function

bindings[key].destroy();

(ext/src/Component.js)

My code of my view which extend 'Ext.window.Window' :

Code:

buttons: [{
        text:       __('CLOSE_BUTTON'),
        handler: function(){
//            Ext.getCmp('windowC').close();
            this.previousNode('window').close();
        },
        cls:        'button-green'
    }]

My code are wrong ?

Thank you for your help