TabContainer is an ASP.NET AJAX Control which creates a set of Tabs that can be used to organize page content. A TabContainer is a host for a number of TabPanel controls.

Each TabPanel defines its HeaderText or HeaderTemplate as well as a ContentTemplate that defines its content. The most recent tab should remain selected after a postback, and the Enabled state of tabs should remain after a postback as well.

TabContainer layout provides option to set TabPanels at top, topright, bottom, bottomright. TabContainer also provides option to set TabPanels at left, leftbottom, right and rightbottom by setting UseVerticalStripPlacement to true.

Tabs can be loaded all at one time or on demand. Each tab provides functionality to load tab in three different modes - always, once or none.

Tab can be accessed by keyboard. After focus is set on the tab container then you can navigate to different tabs by using the left and right arrow keys. When tabs are displayed vertically then Up and Down arrow keys can be used to navigate from tab to tab.

The control above is initialized with this code. The italic properties are optional:

<ajaxToolkit:TabContainer runat="server" 
        OnClientActiveTabChanged="ClientFunction" 
        Height="150px"
        Width="400px"
        ActiveTabIndex="1"        
        OnDemand="true"        
        AutoPostBack="false"
        TabStripPlacement="Top"
        CssClass="ajax__tab_xp"
        ScrollBars="None"
        UseVerticalStripPlacement="true"
        VerticalStripWidth="120px"
        >
    <ajaxToolkit:TabPanel runat="server" 
        HeaderText="Signature and Bio"
        Enabled="true"
        ScrollBars="Auto"        
        OnDemandMode="Once"
        <ContentTemplate>
            ...
        </ContentTemplate>
    />
</ajaxToolkit:TabContainer>

• ActiveTabChanged (Event) - Fired on the server side when a tab is changed after a postback
• OnClientActiveTabChanged - The name of a javascript function to attach to the client-side tabChanged event
• CssClass - A css class override used to define a custom look and feel for the tabs. See the Tabs Theming section for more details.
• ActiveTabIndex - The first tab to show
• Height - sets the height of the body of the tabs (does not include the TabPanel headers)
• Width - sets the width of the body of the tabs
• ScrollBars - Whether to display scrollbars (None, Horizontal, Vertical, Both, Auto) in the body of the TabContainer
• TabStripPlacement - Whether to render the tabs on top of the container or below (Top, Bottom)
• UseVerticalStripPlacement - Whether to render the tabs on left or right of the container
• VerticalStripWidth - Width of the tab panels when displaying tabs vertically
• AutoPostBack - Make auto postback from the javascript when tab index changes.
• OnDemand - Whether to render/load tabs onDemand or all at page load

• Enabled - Whether to display the Tab for the TabPanel by default. This can be changed on the client.
• OnClientClick - The name of a javascript function to attach to the client-side click event of the tab.
• HeaderText - The text to display in the Tab
• HeaderTemplate - A TemplateInstance.Single ITemplate to use to render the header
• ContentTemplate - A TemplateInstance.Single ITemplate to use to render the body
• Enabled - Make tab enable or not
• ScrollBars - Whether to display scrollbars (None, Horizontal, Vertical, Both, Auto) in the body of the TabPanel
• OnDemandMode - When container's onDemand is true then whether to load tab - Always, Once, None

.CustomTabStyle .ajax__tab_header {
    font-family:verdana,tahoma,helvetica;
    font-size:11px;
    background:url(images/tab-line.gif) repeat-x bottom;
}

• .ajax__tab_header: A container element that wraps all of the tabs at the top of the TabContainer. Child CSS classes:.ajax__tab_outer.
• .ajax__tab_outer: An outer element of a tab, often used to set the left-side background image of the tab.Child CSS classes: .ajax__tab_inner.
• .ajax__tab_inner: An inner element of a tab, often used to set the right-side image of the tab. Child CSS classes:.ajax__tab_tab.
• .ajax__tab_tab: An element of the tab that contains the text content. Child CSS classes:none.
• .ajax__tab_body: A container element that wraps the area where a TabPanel is displayed. Child CSS classes: none.
• .ajax__tab_hover . This is applied to a tab when the mouse is hovering over. Child CSS classes:.ajax__tab_outer.
• .ajax__tab_active: This is applied to a tab when it is the currently selected tab. Child CSS classes:.ajax__tab_outer.