Autosizing a grid column to take up remaining space in parent

Question

In WPF, I am having a heck of a time trying to get a grid to size properly.

I have the following layout for my grid:

Answer 1

* means fill or share. If you had two with * then they would share the width evenly.

<ColumnDefinition Width="*"/>

Answer 2

Seems I found a solution after a bit more tinkering around.

The problem was: <ColumnDefinition Width="Auto"/>

This was causing the column to fit to the content. I changed it to: <ColumnDefinition />

This causes the column to fit to the empty space left in the parent container, regardless of content size.