Can't find the property 'Items' in class 'TextField'

[rendongsc]

Dynamic controls PostBack raise exception.

Can't find the property 'Items' in class 'TextField'
Ext.Net.ViewStateProcessor.LoadViewState(Object obj, Object state)
Ext.Net.XControl.LoadViewState(Object state)
--------------------------------------------------------------
On System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState)
On System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState)
On System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState)
On System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState)
On System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState)
On System.Web.UI.Control.LoadChildViewStateByIndex(Ar rayList childState)
On System.Web.UI.Control.LoadViewStateRecursive(Objec t savedState)
On System.Web.UI.Control.AddedControl(Control control, Int32 index)
On System.Web.UI.ControlCollection.Add(Control child)
On System.Web.Util.CalliHelper.EventArgFunctionCaller (IntPtr fp, Object o, Object t, EventArgs e)
On System.Web.Util.CalliEventHandlerDelegateProxy.Cal lback(Object sender, EventArgs e)
On System.Web.UI.Control.OnLoad(EventArgs e)
On System.Web.UI.Control.LoadRecursive()
On System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

[Vladimir]

It means that you have different control hierrarchy between requests.
You can find many information about ViewState error in internet (it is very common ASP.NET error)