Why Can't ComoBox control be found when I'm using XAML?

I'm using Visual Studio 2022 and in my .NET Maui application that I'm writing, I'm trying to add a combo box in my XAML code. So when I first add:

<ComboBox></ComboBox>

I get a squiggly line under the word ComboBox and the message:

The 'ComboBox' weas not found. Verify that you are nit missing an assembly reference and that all referenced assemblies have been built.

Is there anything else I have to the xaml file to make .NET Maui see a combo box?