How to open picker for item selection?

How to open picker for item selection which can give the user way to select a content or a image in workspace?

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Currently picker is opening. When I use the following javascript but the site tab is not getting populated. Please check

var picker = vui.ext.create('vui.ui.Picker', {
   panels: [{
       xtype: 'panel.Site'
   },
   {
       xtype: 'panel.Search'
   }],
   actionMsg: 'Pick these items.',
   multiSelect: false,
   autoShow: true,
   listeners: {
           ok: function(items) {
       }
   }
});
picker.createWindow({title:'Select an Item'}).show();