ScrollViewer not scrolling in WPF

Question

I am using a scrollviewer control around my stack panel which contains an ItemsControl. When there are many items in the ItemsControl it is suppose to scroll but for some re

Answer 1

You must fix the Height of the Scrollviewer, but can easily bind to the StackPanel ActualHeight:
(tested code)

Or better yet, if you can't change the name of the StackPanel:

It is a "You first" problem, the StackPanel ask the ScrollViewer for the Height and the ScrollViewer ask the StackPanel for the max Height it can be.