Question

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!

Answer 1

If I’m reading your XAML correctly, you are creating a single Chart control for the TabControl and changing its data when the TabItem changes? If so, you should be able to use the SelectionChanged event.

You might be better off putting your Chart control in the ItemTemplate so it automatically loads the selected Flights data when the user switches tabs or adds a new one.