Order of columns in Grid is not maintained once we freeze and unfreeze the grid

http://www.smartclient.com/smartgwtee/showcase/#customComponents

In the List Grid, if you freeze a column and unfreeze it, the order of the columns is not maintained. Is it designed that way or is it a bug?
Actual Result:
original order of the columns is not maintained after unfreezing
Expected Result:
original order of the columns should be maintained after unfreezing