Returns the item that the preview panel should preview at a given index.
Original signature is '- (id <QLPreviewItem>)previewPanel:(QLPreviewPanel *)panel previewItemAtIndex:(NSInteger)index'
Available in Mac OS X v10.6 and later.

C# | Visual Basic | Visual C++ |
IQLPreviewItem PreviewPanelPreviewItemAtIndex( QLPreviewPanel panel, NSInteger index )
Function PreviewPanelPreviewItemAtIndex ( _ panel As QLPreviewPanel, _ index As NSInteger _ ) As IQLPreviewItem
IQLPreviewItem^ PreviewPanelPreviewItemAtIndex( QLPreviewPanel^ panel, NSInteger index )

- panel (QLPreviewPanel)
- The preview panel.
- index (NSInteger)
- The index of the item to preview.

The item that the preview panel should preview at index index.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)