<com:TContent ID="Content"> <h1>Add Dynamic Custom TTemplateControl Test</h1> <com:TActivePanel ID="Foo"> <com:TTextBox ID="foo" /> </com:TActivePanel> <com:TActiveButton ID="button2" Text="Button 1" OnClick="button2_onclick" OnCallback="button2_callback"/> <com:TActivePanel ID="placeholder" /> <com:TActiveLabel ID="label1" Text="Label 1" /> </com:TContent>