Gets or sets the number of columns used to render levels.
[PersonalizableAttribute(PersonalizationScope.Shared)] [WebBrowsableAttribute(false)] public int DisplayColumns { get; set; }
A column starts only at Level1. To render more than one column, you must specify more than one Level1 level. The default value is 3. If a negative number or 0 is passed to the setter property, a value of 1 is assumed.