set/get Datepicker value ExtJS

I'm using Sencha Architect (Ext.menu.DatePicker). But I have a problem with getters and setters.

This is my datepicker:

Code:

{       xtype: 'datemenu',       floating: false,       height: 242,       id: 'calendarT',       width: 241 }

And later to get value I'm using .getValue() function:

Code:

console.log(Ext.getCmp('calendarT').getValue());

But firebug says: 'TypeError: Ext.getCmp(...).getValue is not a function'

With set is the same problem.

Any solution?

Thanks for all, Ivan.