How to make items in a StackPanel expand to fit all available space in WPF?

This should do it - I set it up so that the TreeView and the ListView shared the main view 50/50; if you don't want that, set it to 'Auto' and '*' or something. Use "LastChildFill" to your advantage!

Use a DockPanel instead. StackPanel explicitly doesn't care about visible space, whereas DockPanel does all of it's size calculation based on available space.

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