How can I check only that textboxes are that Visibility.Visible in the running program? WPF

How can I check only that textboxes are that Visibility.Visible in the running program?

I have code for Winforms

foreach (var textbox in rootControl.Controls.OfType<TextBox>().Where(t => t.IsVisible))

But I need that for WPF

I know, It should look smth like this

foreach (TextBox tb in this.FindName.OfType<TextBox>().Where(tb => tb.IsVisible))

Can you please help me this work well?