Refreshin components

Hi Isomorphic,
I have a problem refreshing components. I created a ListGrid with autochild, I move the column widths and then I destroy the VLayout where I used as grid container -VLayout.destroy()-. When reloading again the grid, it's appear as the columns we had previously moved.
Is ListGrid loaded in the cache of navigator? How can I get this to be totally eliminated?
Regards,
Javier

Navigator: IE.11
SmartClient: 9.1 - 20140530