Problem with refresh data in UpdatePanel

[wiertara]

Hi, i have a problem with refreshing data in UpdatePanel. In aspx file
i have a AjaxToolKit TabContainer and inside it a UpdatePanel:

<asp:UpdatePanel ID="upRemoveUser" runat="server"
OnLoad="upRemoveUser_Load">
<ContentTemplate>
<center>
<aspanel ID="pnlInfoRemove"
runat="server" Height="20px" Width="400px" Visible="false">
<asp:Image ID="imgInfoRemove"
runat="server" Height="14px" />
<asp:Label ID="lblInfoRemove"
runat="server" ForeColor="Blue" Text="Label"></asp:Label>
</aspanel>
<table class="NewUser">
<tr class="Login">
<td colspan="2"
class="tableHeader" align="center">
Usuñ u¿ytkownika</td>
</tr>
<tr>
<td class="Login"
align="right">
Login u¿ytkownika:</
td>
<td align="left">
<aspropDownList
ID="ddlUsersToRemove" runat="server" Width="250px" AutoPostBack="True"

DataTextField="NameAndLogin" DataValueField="ID" CssClass="textBox">
</aspropDownList>
</td>
</tr>
<tr>
<td class="Login"
align="right">
Nazwa u¿ytkownika:</
td>
<td align="left">
<asp:TextBox
ID="txtRemoveName" runat="server" MaxLength="70" Width="80%"
ReadOnly="True"
CssClass="textBox"
Enabled="false"></asp:TextBox>
<asp:Label ID="Label1"
runat="server" ForeColor="Red" Width="5px"></asp:Label>
</td>
</tr>
<tr>
<td align="right">
Uprawnienia:</td>
<td align="left">
<aspropDownList
ID="ddlRemoveRights" Width="81%" runat="server" Enabled="False"
CssClass="textBox">
<asp:ListItem
Selected="True" Value="0">U¿ytkownik podstawowy</asp:ListItem>
<asp:ListItem
Value="1">U¿ytkownik zaawansowany</asp:ListItem>
</aspropDownList></
td>
</tr>
<tr>
<td>
</td>
<td>
<asp:Button
ID="btnRemoveUser" runat="server" Text="Usuñ"
OnClick="btnRemoveUser_Click" />

<cc1:ConfirmButtonExtender ID="cbeRemoveUser" runat="server"
TargetControlID="btnRemoveUser"
ConfirmText="Czy
na pewno chcesz usun±æ tego u¿ytkownika?">
</
cc1:ConfirmButtonExtender>
</td>
</tr>
</table>
</center>
</ContentTemplate>
</asp:UpdatePanel>

In upRemoveUser_Load event i get data from database and fill TextBox
and DropDownList:

protected void upRemoveUser_Load(object sender, EventArgs e)
{
selectedUserRemove = GetUserDetails(ddlUsersToRemove);

if (selectedUserRemove != null)
{
txtRemoveName.Text = selectedUserRemove.Name;
ddlRemoveRights.SelectedIndex =
Convert.ToInt32(selectedUserRemove.Advanced);
}
}

After page loading and after first DropDownList value change
everything is ok but after every next change nothing happens While
dubugging TextBox text and DropDownList selectedIndex are changing but
no change is visible on interface.

Please help me