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    copied!<p>Here a new solution that does almost what your need :</p> <ol> <li>The <code>OnClientActiveTabChanged</code> event is raised</li> <li>The <code>tabcontainer</code> New Tab index is saved in a <code>Hiddenfield</code></li> <li>The <code>tabindex</code> is reset to it's old value (so it wont change right now)</li> <li>The form trigger a asyncpostback using a hidden button.</li> <li>Within the hidden button's <code>Click event</code>, the OldTabIndex and NewTabIndex are retrieved.</li> <li>At the end of the Click event, the tabcontainer's <code>tabindex</code> is switched to the new value.</li> </ol> <p>So, the hidden button's Click event is executed before the TabContainer tab is changed.</p> <p>aspx:</p> <pre><code>&lt;asp:Button runat="server" ID="hiddenTargetControlForTabContainer" style="display:none" /&gt; &lt;asp:UpdatePanel ID="TabContainerUpdatePanel" runat="server"&gt; &lt;Triggers&gt; &lt;asp:AsyncPostBackTrigger ControlID="hiddenTargetControlForTabContainer" /&gt; &lt;/Triggers&gt; &lt;ContentTemplate&gt; &lt;asp:HiddenField ID="TabContainerActiveTab" runat="server" Value="0" /&gt; &lt;AjaxControlToolkit:TabContainer ID="TabContainer1" runat="server" ActiveTabIndex="0" OnClientActiveTabChanged="OrderTabContainerClientActiveTabChanged" &gt; &lt;AjaxControlToolkit:TabPanel runat="server" ID="TabPanel1" HeaderText="TabPanel1" &gt; &lt;ContentTemplate&gt; &lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;/ContentTemplate&gt; &lt;/AjaxControlToolkit:TabPanel&gt; &lt;AjaxControlToolkit:TabPanel runat="server" ID="TabPanel2" HeaderText="TabPanel2" &gt; &lt;ContentTemplate&gt; &lt;asp:TextBox ID="TextBox2" runat="server"&gt;&lt;/asp:TextBox&gt; &lt;/ContentTemplate&gt; &lt;/AjaxControlToolkit:TabPanel&gt; &lt;/AjaxControlToolkit:TabContainer&gt; &lt;/ContentTemplate&gt; &lt;/asp:UpdatePanel&gt; &lt;script type="text/javascript"&gt; var TabContainerActiveTabControlID = '&lt;%= TabContainerActiveTab.ClientID %&gt;'; var hiddenTargetControlForTabContainerControlID = '&lt;%= hiddenTargetControlForTabContainer.uniqueID %&gt;'; function OrderTabContainerClientActiveTabChanged(sender, args) { var TabContainerActiveTabControl = $get(TabContainerActiveTabControlID); var OldtabIndex = parseInt(TabContainerActiveTabControl.value); var NewtabIndex = sender.get_activeTabIndex(); if (!(OldtabIndex == NewtabIndex)) { sender.set_activeTabIndex(OldtabIndex); TabContainerActiveTabControl.value = NewtabIndex; __doPostBack(hiddenTargetControlForTabContainerControlID, ''); } } </code></pre> <p> </p> <p>Code behind:</p> <pre><code>Protected Sub hiddenTargetControlForTabContainer_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles hiddenTargetControlForTabContainer.Click Dim oldActiveTabIndex = TabContainer1.ActiveTabIndex Dim newActiveTabIndex As Integer = Convert.ToInt32(TabContainerActiveTab.Value) 'your stuff here TabContainer1.ActiveTabIndex = newActiveTabIndex End Sub </code></pre>
 

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