How would a developer set a control to hidden in Ext?

Extjs 4.x is Sencha's latest JavaScript framework for developing cross-platform web applications

Which of the following parameter type(s) is a valid renderTo config option value?

The utility method "Ext.define" is used for which one of the following?

What is the name of the class that provides the developer with an area autosized to the browser viewport?

The _______ is a subclass of VBoxLayout. This already tells us that the components will be organized vertically in the container. We can collapse or expand the items.

Which of the following is not a subclass of Ext.grid.column.Column?

What is the method to create a class in ExtJS 4.*?

What is the name of the method that allows a developer to remove an event listener from an object or control?

Which types of objects in Ext fire an initComponent event?

The ____ classes are resonsible for decoding the raw data from a server that is to be loaded into a Model instance or Store.