Can't select Element in WPF Application

I am building a bot and have an application that is developed with WPF. In the application is a questionnaire that has to be filled out by the bot.

But when I try to set a selector the whole element (questionnaire) has only the following properties:


The element has no child elements, but I see them in the GUI and need them as selectors. Unfortunately even Computer Vision does not recognize all elements correctly.

Any idea?