The procedural way of loading an SDT (like the one needed in the TabbedView Web Component) is:

Event Start
   ...
   &Tabs = new()
   &TabsItem = new()
   &TabsItem.Code         = 'General'
   &TabsItem.Description  = 'General info'
   &TabsItem.Link         = link(ViewCustomer, CustomerId, 'General'
   &TabsItem.WebComponent = create(CustomerGeneral, CustomerId)
   &Tabs.add(&TabsItem)
   &TabsItem = new()
   &TabsItem.Code         = 'Invoices'
   &TabsItem.Description  = 'Invoices'
   &TabsItem.Link         = link(ViewCustomer, CustomerId, 'Invoices'
   &TabsItem.WebComponent = create(CustomerInvoices, CustomerId)
   &Tabs.add(&TabsItem)
   ...
   TabWC.Object = Create(TabbedView, &Tabs)
Endevent

Using Data Providers, the declarative way is:

LoadCustomerTabs

Tabs
{ 
   TabOptionsItem
   {
      Code           = 'General'
      Description    = 'General info'
      Link           = link(ViewCustomer, CustomerId, 'General'
      WebComponent   = create(CustomerGeneral, CustomerId)
   } 
   TabOptionsItem
   {
      Code           = 'Invoices'
      Description    = 'Invoices'
      Link           = link(ViewCustomer, CustomerId, 'Invoices'
      WebComponent   = create(CustomerInvoices, CustomerId)
   }
} 

So the Event Start becomes:

Event Start

   &Tabs = LoadCustomerTabs()

   TabWC.Object = Create(TabbedView, &Tabs)

Endevent