this.panel.show();
Ext.getDoc().on("mousedown", this.handleDocMouseDown, this);

handleDocMouseDown : function(e) {
　　if (!e.within(this.panel.getEl())) {
   　　this.panel.destroy();
   　　Ext.getDoc().un("mousedown", this.handleDocMouseDown, this);
　　}
}

Ext.applyIf(me, {
        items: [
            {
                xtype: ‘button‘,
                text: ‘Done‘,
                listeners: {
                    click: {
                        fn: me.onDoneButtonClick,
                        scope: me
                    }
                }
            }
        ],
        listeners: {
            el: {
                blur: {
                    fn: me.onWindowLoseFocus,
                    scope:me
                }
            }               
        }
    });