Adding and Editing Templates at Runtime

You can also add templates to RadTabStrip at runtime, using the TabTemplate property. This property is of type ITemplate, so you must assign an object that implements that interface as a value:

The tabs should be dynamically added so that templates can be defined at run time. Also, the tabs should be bound to be able to eval DataBinder expressions. In other words, you should call the DataBind method of the RadTabStrip object or bind the tabs that are about to use DataBinder.Eval. You can bind a specific tab by calling the DataBind method of this specific tab.

The TabTemplate should be initialized in the OnInit event of the page. This is needed as the template should be instantiated before the RadTabs are initialized.

protected override void OnInit(EventArgs e)
{
   RadTabStrip1.TabTemplate = new TextBoxTemplate();        
   base.OnInit(e);
}
protected void Page_Load(object sender, EventArgs e)
{
   if (!Page.IsPostBack)
   {
       RadTabStrip1.Tabs.Add(new RadTab("root1"));
       RadTabStrip1.Tabs.Add(new RadTab("root2"));
   }
   RadTabStrip1.DataBind();
}
class TextBoxTemplate : ITemplate
{
   public void InstantiateIn(Control container)
   {
       Label label1 = new Label();
       label1.ID = "ItemLabel";
       label1.Text = "Text";
       label1.Font.Size = 10;
       label1.Font.Bold = true;
       label1.DataBinding += new EventHandler(label1_DataBinding);
       container.Controls.Add(label1);
   }
   private void label1_DataBinding(object sender, EventArgs e)
   {
       Label target = (Label)sender;
       RadTab tab = (RadTab)target.BindingContainer;
       string tabText = (string)DataBinder.Eval(tab, "Text");
       target.Text = tabText;
   }
}   

Protected Overloads Overrides Sub OnInit(ByVal e As EventArgs)
 RadTabStrip1.TabTemplate = New TextBoxTemplate()
 MyBase.OnInit(e)
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
 If Not Page.IsPostBack Then
  RadTabStrip1.Tabs.Add(New RadTab("root1"))
  RadTabStrip1.Tabs.Add(New RadTab("root2"))
 End If
 RadTabStrip1.DataBind()
End Sub
Class TextBoxTemplate
 Implements ITemplate
 Public Sub InstantiateIn(ByVal container As Control) Implements ITemplate.InstantiateIn
  Dim label1 As New Label()
  label1.ID = "ItemLabel"
  label1.Text = "Text"
  label1.Font.Size = 10
  label1.Font.Bold = True
  AddHandler label1.DataBinding, AddressOf label1_DataBinding
  container.Controls.Add(label1)
 End Sub
 Private Sub label1_DataBinding(ByVal sender As Object, ByVal e As EventArgs)
  Dim target As Label = DirectCast(sender, Label)
  Dim tab As RadTab = DirectCast(target.BindingContainer, RadTab)
  Dim tabText As String = DirectCast(DataBinder.Eval(tab, "Text"), String)
  target.Text = tabText
 End Sub
End Class           

If you for some reason cannot define the template in the OnInit event of the page, you could use another approach:

The template has to be instantiated for each tab upon a postback. Since the TextBoxTemplate class initializes the label on InstantiateIn we called the InstantiateIn method of the TextBoxTemplate object for each tab.

protected void Page_Load(object sender, EventArgs e)
{

   if (!Page.IsPostBack)
   {
       RadTabStrip1.Tabs.Add(new RadTab("root1"));
       RadTabStrip1.Tabs.Add(new RadTab("root2"));
   }
   TextBoxTemplate template = new TextBoxTemplate();
   foreach (RadTab tab in RadTabStrip1.GetAllTabs())
   {
       template.InstantiateIn(tab);
   }
   RadTabStrip1.DataBind();
}               

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
 If Not Page.IsPostBack Then
  RadTabStrip1.Tabs.Add(New RadTab("root1"))
  RadTabStrip1.Tabs.Add(New RadTab("root2"))
 End If
 Dim template As New TextBoxTemplate()
 For Each tab As RadTab In RadTabStrip1.GetAllTabs()
  template.InstantiateIn(tab)
 Next
 RadTabStrip1.DataBind()
End Sub                 

The end result of this code looks like the following: