Label text not showing after postback

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VB

ASP.NET

Ajax

Label text not showing when im click button event. Because telerik control using in this page.
How to solve this issue?

I mention the example coding in following below


Asp.Net

<telerik:RadWindowManager ID="RadWindowManager1" runat="server" EnableShadow="true">
</telerik:RadWindowManager>

<asp:UpdatePanel ID="updPanel" runat="server">
<ContentTemplate>

<telerik:RadButton ID="btnSave" runat="server" Skin="Default" Text="Register Client"
 OnClientClicked="CreateTPA">  </telerik:RadButton>
</ContentTemplate>
    </asp:UpdatePanel>



<div><asp:Label ID="lblmsg" runat="server" ForeColor="Red"></div>

Vb.Net Coding

Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSave.Click

lblmsg.Text = "Error!"

 End Sub