I just discovered there is a bug in the RC version of VS 2010 it is not generating the designer code for controls within an Ajax Tab Control. Have a look here
In VS 2008 the following
<:asp:TabContainer ID=”TabContainer1″ runat=”server” ActiveTabIndex=”1″>
<:asp:TabPanel runat=”server” HeaderText=”Contacts” ID=”TabPanel1″>
<:ContentTemplate>
<:asp:UpdatePanel ID=”UpdatePanel1″ runat=”server” ChildrenAsTriggers=”false” UpdateMode=”Conditional”>
<:ContentTemplate>
<:asp:TextBox ID=”txJoe” runat=”server”>
<:/asp:TextBox>
<:/ContentTemplate>
<:/asp:UpdatePanel>
<:/ContentTemplate>
<:/asp:TabPanel>
<:/asp:TabContainer>
Will generate the following line in the designer code file
protected global::System.Web.UI.WebControls.TextBox txJoe;
However in VS2010 this does not get generated and so you cannot access the control in your code behind file. Hopefully we will get a fix soon and don’t have to wait for the RTM.
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