Version(s) of Ext GWT
Ext GWT 3.0.1

Browser versions and OS (and desktop environment, if applicable)
IE 9 Windows 7

Virtual Machine
No

Description
Take a LiveGrid and disable column sorting:
Code:
columnConfig.setSortable(false);    
columnConfig.setMenuDisabled(true);
Although the sorting is now disabled, clicking on the column's header makes the grid reload the data, which is unnecessary in this case.

Run mode
Development Mode