WPF: ListBox with WrapPanel, vertical scrolling problem

Question

I have a UserControl (XAML below) that has a ListBox that I want to display images inside a WrapPanel, where images are displayed as many as will fit on one row and then wra

Answer 1

Well, I finally stumbled upon the solution. I was adding my UserControl to a placeholder panel that looked like this:

However, when I switched it to a Grid instead, things started to work the way I wanted:

I think it has to do with the StackPanel not taking up all the vertical space by default, like the Grid is doing.