You can get the current column of the item in the following way:
// In case you added RadtileViewItem objects in the TileView
Grid.GetColumn(tileViewName.Items as RadTileViewItem);
// Alternatively, in case you populated the TileView from a data source
Grid.GetColumn(tileViewName.ItemContainerGenerator.ContainerFromItem(dataItem) as RadTileViewItem);
Of course, the above code makes sense only when all items are in Restored state - otherwise there is a Maximized item and the rest are in the same column or row depending on where the minimized items are docked.
I hope I was able to help. Let me know if you have any other questions.
the Telerik team