Taking a look at the example at: http://dev.sencha.com/deploy/ext-4.0.0/examples/grid/locking-grid.html
The last row at the bottom is "wal-mart". How would I make that bottom row unsortable?
The way it is now, if I sort any column, Wal-mart may potentially move with the sort, and no longer be at the bottom. I want it to stay at the bottom, because I'm going to turn the bottom row into a "totals" row that will add up the values of all the rows above it, so it needs to stay at the bottom.