How can a WPF StackPanel fill vertically from bottom to top?

Question

I need to be able to fill a stackpanel with buttons but the buttons must appear at the bottom of the stackpanel first and populate upwards<

Answer 1

I found that using a UniformGrid with Column=1 gives a neat filling stack, or set Rows=1 give a neat horizonatally filled stack. And adding from the index 0 will work from bottom up.