I have a gridPanel object and I need to save the column configuration in cookies.
This is my source:

var cp = new Ext.state.CookieProvider({
expires: new Date(new Date().getTime()+(1000*60*60*24*30)) //30 days

// create the Grid
var m_grid = new Ext.grid.GridPanel({
stateful: true,
stateEvents: ['columnresize', 'columnmove', 'show', 'hide']

Every state event cookie is saved fine except for data about hidden/shown columns. What events should I use? Any help appreciated.