Returns the subitem of the System.Windows.Forms.ListViewItem at the specified coordinates.
The System.Windows.Forms.ListViewItem.ListViewSubItem at the specified x- and y-coordinates.
The ListViewItem.GetSubItemAt(int, int) method will return null if the System.Windows.Forms.ListView is not in View.Details view, or there is not a System.Windows.Forms.ListViewItem.ListViewSubItem located at the specified point.