Why would a developer use buffered scrolling?

Extjs 4.x includes a new pattern concept named MVC.

The LocalStorageProxy uses the new HTLM5 localStorage API to load and save data into the client brwoser

What is the name of the method on an Ext.data.store that synchronizes the records in the store with a remote data source?

True or false? Ext Js supports all major web browsers including: IE 6+,Firefox 1.5+(Pc,Mac),Safari 3+,Opera9+(Pc,Mac).

Extjs 4 introduces a new package organization and that is why some classes names are not the same as they were in Extjs 3.

What method can be use to retrieve a DOM element?

Which statement about the emptyCellText is false?

What is the event name that fires when a user checks a checkbox in Ext 4.0?

What is the proper syntax to set up global theme variables in Ext?

The ________ validation varifies is the value is present (0(zero) is a valid value,but an empty string is not).