Question

My WPF application has a TabControl with 4 TabItem’s.
Each TabItem has a different ListView with GridView as View.
The ItemContainerStyle of the TabControl define a custom Header with the ‘normal’ ContentPresenter and a TextBox.

How can I update the TextBox of each TabItem header to show the number of items of each LisView when ListView.ItemSource changes? The ItemSource is periodically set asynchronously from a thread in code behind.

RunOnUI(() =>
{
firstTabList.ItemsSource = itemsFirstList;
});

Thanks

Answer 1

If you’re using code behind then you can name your TabItem

<TabItem x:Name="tabItem1" ...>

and then set the header when you update the ItemsSource

RunOnUI(()=>{
    firstTabList.ItemsSource = itemsFirstList;
    tabItem1.Header = string.Format("Header: {0}", itemsFirstList.Count);
}