Defines whether items in a WPFItemsControl, like WPFComboBox or WPFListBox, are pre-filled during recording and playback. WPF itself lazily loads items for certain controls, so these items are not available for Silk Test Workbench if they are not scrolled into view. Turn pre-filling on, which is the default setting, to additionally access items that are not accessible without scrolling them into view. However, some applications have problems when the items are pre-filled by Silk Test Workbench in the background, and these applications can therefore crash. In this case turn pre-filling off.