I? having problems with the LoadControl method in combination with form authentication.
When I use form authentication my input fields are not filled with the Request.Form values.

How do I get this code to work in combination with Form authentication.

I'm using Ext.NET Pro version

In my code I? using a custom control, but I have managed to reproduce the symptoms when dynamically creating a window.

Request body with <authentication mode="Forms">

The value is pressent : 'UC_UCrfText=MyValue' but not set in the TextField

__EVENTTARGET=ctl02&__EVENTARGUMENT=UC_UCbtnWinAcc ept%7Cevent%7CClick&__VIEWSTATE=TCUIPNgzEvuclUQG%2 FYGG1y%2BgwNawPBpfhTltr0LUSsWgz7%2F%2FOvCRyJFQTUWk dtxWFr%2FPVsumi8qyPVpuHb%2BLcRoDRRdD46jwaIQRHp9JhL 6NSTxEPlpcBVcb4aeJ%2B%2F19l0X3jVk0vkNKlWBvN8dD2BKY lGxssI5KR6%2Fxz7XdGJT95kkExcYLNjho15WvD056&hdLoade d=loaded&__VIEWSTATEGENERATOR=F97A37F8&__EVENTVALI DATION=wsYSiEyyiSnsdWRP2gh%2BFb5UeCv44s8hrtcCxm0qA WACf4FEbfHYNpAhd%2FdH74LRhOD6cuXDcb1nM9D5mAABtHX1r l2MvzbySjadYzai1oBGPxCDvVZEetrXqmz4lUVj&UC_UCrfTex t=MyValue

Response body:
{script:"Ext.Msg.show({\"title\":\" InputValue = []\",\"buttons\":false});App.UC_UCmyWin.close();" }

Request body without <authentication mode="Forms">
The 'UC_UCrfText=MyValue' is pressent and also set in the TextField.

hdLoaded=loaded&__VIEWSTATEGENERATOR=F97A37F8&__EV ENTTARGET=ctl02&__EVENTARGUMENT=UC_UCbtnWinAccept% 7Cevent%7CClick&UC_UCrfText=MyValue

Response body:
{script:"Ext.Msg.show({\"title\":\" InputValue = [MyValue]\",\"buttons\":false});App.UC_UCmyWin.close();" }

<%@ Page Language="C#" AutoEventWireup="true" %>

<script runat="server">
const string controlUrl = @"ExtUserControl.ascx";
private UserControl currentUC;
protected void Page_Load(object sender, EventArgs e)
	if (IsLoaded())
private void LoadUserControl(string code, bool update = false)
	Ext.Net.Panel panel = this.pnlContainer;
	if (update && currentUC != null) 
	currentUC = (UserControl)this.LoadControl(controlUrl);
	currentUC.ID = "UC";
	if (update)
private bool IsLoaded()
	return !string.IsNullOrEmpty(hdLoaded.Text);
protected void OnLoadControl(object sender, DirectEventArgs e)
	this.LoadUserControl(controlUrl, true);
	hdLoaded.Text = "loaded";
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<form id="form" runat="server">
	<ext:ResourceManager runat="server" />
	<ext:Hidden runat="server" ID="hdLoaded" />
	<ext:Panel ID="pnlContainer" runat="server" Height="400" Width="400" Title="Containter">
		<ext:Toolbar runat="server">
			<ext:Button ID="btnX" runat="server" Text="Load" OnDirectClick="OnLoadControl" />

<%@ Control Language="C#" AutoEventWireup="true" %>
<%@ Register assembly="Ext.Net" namespace="Ext.Net" tagprefix="ext" %>

<script runat="server">
private Window _win;
private TextField _tf;
protected void Page_Load(object sender, EventArgs e)
public void Show()
private string GetId(string id)
	return ID + id;
private void BuildWindow()
	_win = new Ext.Net.Window { ID = GetId("myWin"), BodyPadding = 5, Border = false, Height = 300, Width = 300, Title = "Enter a value and press ClickMe", Hidden = true, Modal = true };
	Ext.Net.Button button = new Ext.Net.Button { ID = GetId("btnWinAccept"), Text = "ClickMe", Icon = Icon.ApplicationError };
	button.DirectEvents.Click.Event += WinClickAccept;
	_tf = new TextField { ID = GetId("rfText") };
private void WinClickAccept(object sender, DirectEventArgs e)
	var txtResult = _tf.Text;
	Ext.Net.X.MessageBox.Show(new MessageBoxConfig() { Title = string.Format(" InputValue = [{0}]", txtResult) });
<ext:Button ID="Button1" runat="server" Text="ClickMe">
		<Click Handler="#{DirectMethods}.Show();" />

When using this in the web.config I cannot get the Textfield value
<authentication mode="Forms">
	<forms loginUrl="~/WebForm.aspx" />