Sencha touch中类似iPad的弹出式窗口

var gkpopover = new Ext.Panel({
id :\'gkpopoverpanel\',
floating:true,
modal:true,
width:\'100px\',
height:\'100px\',                                             });

gkpopover.show(\'pop\');

        //show info popover?
    var popoverpanel = new Ext.Panel({
        modal:true,
        left:\'10%\',
        top:\'10%\',
        width:\'80%\',
        height:\'80%\',
        hideOnMaskTap: true,
        html:data.info
    });
    Ext.Viewport.add(popoverpanel);
    popoverpanel.show(\'pop\');

new Ext.Panel({
fullscreen : true,
items      : [
    {
        xtype  : \'toolbar\',
        docked : \'top\',
        items  : [
            {
                text    : \'Open\',
                handler : function (button) {
                    var panel = new Ext.Panel({
                        height : 200,
                        width  : 200,
                        html   : \'Hello\'
                    });

                    panel.showBy(button, \'tr-bc?\');
                }
            }
        ]
    }
]});