WPF TabControl - In need of a default message before tabs load

Question

I have a WPF TabControl who's TabItems are MEF'd in at run time. However, they are MEF'd in only when a certain item in a left-hand treeview is selected. What I'd like to do is display a centered message inside the TabControl indicating "No Active Scenario Selected". I tried adding a TextBlock inside the TabControl but what I got was a TabItem instead. Any ideas?

Answer 1

One way to do this is simply by putting a TextBlock on top of the TabControl and show it when the TabControl doesn't have any Tabs added.

You can bind the Visibility of the TextBlock to the HasItems property of the TabControl and use a value converter (BooleanToVisibilityConverter or your own implementation) to show and hide the TextBlock.