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Код

var eventItems = [];
for (var i=0;i<this.events.length;i++){
  eventItems.push({
     boxLabel: (this.events[i].name in this.eventTitles)?this.eventTitles[this.events[i].name]:this.events[i].name,
     name: this.events[i].name}
  );
}

var items = [];
items.push(new Ext.ux.ImageButton({
  image: this.imgPath + '/info-btn.png',
  onClick: function() { }
}));
items.push(new Ext.ux.ImageButton({
  image: this.imgPath + '/zoom-btn.png',
  onClick: function() {}
}));
items.push(new Ext.ux.ImageButton({
  image: this.imgPath + '/print-btn.png',
  onClick: function() {},
}));
items.push(new Ext.ux.ImageButton({
  image: this.imgPath + '/email-btn.png',
  onClick: function() { }
}));

if (eventItems.length) {
  items.push(new Ext.form.CheckboxGroup({
    fieldLabel: 'Events',
    hideLabel: false,
    items: eventItems,
    width: 300
  }));
}
        
var panel = new Ext.Panel({
  border: true,
  layout: 'column',
  cls: 'bordered',
  items: items
});
panel.render(this.el);