[ Version ( since = "2.4" ) ]
public int column_span_column { get; set; }
If this is set to a non-negative value, it must be the index of a column of type g_type_int in the model.
The value in that column for each item will determine how many columns that item will span in the popup. Therefore, values in this column must be greater than zero, and the sum of an item’s column position + span should not exceed wrap_width.