How do I make a WPF data template fill the entire width of the listbox?

Question

I have a ListBox DataTemplate in WPF. I want one item to be tight against the left side of the ListBox and another item to be tight ag

Answer 1

Extending Taeke's answer, setting the ScrollViewer.HorizontalScrollBarVisibility="Hidden" for a ListBox allows the child control to take the parent's width and not have the scroll bar show up.