The virtualization method to use for this collection when a scroll bar is visible. Takes a value from the CollectionVirtualizationMethod enum.
The default values is FixedHeight.
When using fixed height, you need to specify the fixedItemHeight property.
Fixed height is more performant but offers less flexibility on content.
When using DynamicHeight, the collection will wait for the actual height to be computed.
Dynamic height is more flexible but less performant.