Question

I have a TabControl.
While clicking a button I want to add a new TabItems to the TabControl.
Among various techniques I’ve chosen to create UserControl inside of a DockPanel.
Everything works fine, except for the location of control on a new TabItem is not 0 and it is
not expanded on the main form resize.
Everything is quite simple.

    <TabItem Header="new control">
        <DockPanel LastChildFill="True">
           <tc:TabItemTemplate/>
        </DockPanel>
    </TabItem>

And TabItemTemplate is also located inside a DockPanel, but it’s not docked inside a TabItem. What’s the catch?

Answer 1

I would suggest using TabControl.ItemTemplate, and bind TabControl.ItemsSource to ObservableCollection of ViewModels. When user clicks on a button, add new View Model instance to the collection. Refer to this article for more details: WPF Apps With The Model-View-ViewModel Design Pattern