Add immovable "Edit" button to ComboBox in WinUI 3

[Fritierkelle]

Is it possible to add a immovable button (item) to the ComboBox, maybe by custom XAML in the App.xaml like in the image?

(As you can see, the button is immovable below the scrollable part of the ComboBox.)

[Fritierkelle]

#9452