When a new item is added to the `Flights` collection a new `TabItem` is added to the `TabControl`. When a new tab is added, I need to call a method on the Chart control. The problem is I can't figure out the right event to handle.

My XAML looks something like the following:

```
<TabControl Name="chartControl" ItemsSource="{Binding Flights}">
    <TabControl.ItemContainerStyle>
        <Style TargetType="TabItem">
            <Setter Property="Header" Value="{Binding Name}" />
        </Style>
    </TabControl.ItemContainerStyle>
    <TabControl.ContentTemplate>
        <DataTemplate>
            <WindowsFormHost Name="winHost">
                <legacy:Chart></legacy:Chart>
            </WindowsFormHost>
        </DataTemplate>
    </TabControl.ContentTemplate>
</TabControl>

```

* I tried handling the `Loaded` on the `TabControl`,
but *duh* that's only fired once.
* I attempted a `DataTemplate`
`Trigger` on the `RoutedEvent`  

`FrameWorkElement.Loaded` but I'm pretty sure that's not meant for my situation
* I tried an EventSetter but that
didn't quite work the way I want
either

I attempted a few other things, but I don't quite remember them all. 

Any suggestions would be greatly appreciated!