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Null Reference Exception when using ScrollIntoView method on WPFListViewItem

Null Reference Exception when using ScrollIntoView method on WPFListViewItem

Why is the following error reported; when trying to call the ScrollIntoView method against a WPFListViewItem:

This error has previously been reported by customers using SilkTest to test WPF. Internal investigation has concluded that the error is related to the fact that WPFListBoxItems are virtualized by the parent WPFListView, and retrieved via the control's 'Items' property. The problem is that WPFListViewItems are eventually treated as 'disconnected' from their parent control; which is the technical reason for this Null Reference Exception.

Effectively there is nothing SilkTest can do to force the method to work, once a WPFListViewItem has become 'disconnected from its parent'.  However it is possible to workaround this issue; by instead calling ScrollIntoView() against the parent WPFListView, passing in the name of the Item as a parameter.

So instead of using the method like so:

Call ScrollIntoView against the parent WPFListView as follows:


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