I use a TabControl to display a list of items. The ItemView is a separate control I wrote.

       <TabControl SelectedItem="{Binding CurrentItem}"
                    IsSynchronizedWithCurrentItem="True"
                    ItemsSource="{Binding ItemList}">
            <TabControl.ContentTemplate>
                <DataTemplate>
                    <ctrls:ItemView/>
                </DataTemplate>
            </TabControl.ContentTemplate>
            <TabControl.ItemTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding ShortItemDescription}"/>
                </DataTemplate>
            </TabControl.ItemTemplate>
        </TabControl>

If the user presses a Button a new ViewModel is added to the list of ViewModels and the TabControl displays it as a new tab. After adding the new tab is selected.

       <Button Command="{Binding AddItemCommand}"
               Content="Add item"/>

Inside of the new ViewModel is a button that needs to be focused each time a new tab is added. I have tried to use the FocusManager and the Initialized event in the ItemView but these are only called for the first time I add a new tab.

<UserControl x:Class="ItemView"
         ...
         Initialized="ViewInitialized">
<Grid>
    ...

    <!-- Set focus to this button -->
    <Button Content="Search"
            Command="{Binding SearchCommand}"
            Name="SearchButton"
            Grid.Column="0"
            Grid.Row="0"/>
</Grid>
</UserControl>

Any ideas?