The columns that are displayed for an UltraTreeNode are obtained from the ColumnSet property of the most specific Override that applies to the node. The ShowColumns property provides the ability to interrupt this hierarchical resolution for any nodes affected by this Override.
The ShowColumns property is not applicable when the owning UltraTree control's ViewStyle property resolves to ViewStyle.Standard, or when the all Columns collections in the node's ancestor chain are empty.
The ShowColumns property is also not applicable when the owning UltraTree control's ViewStyle property resolves to ViewStyle.OutlookExpress, since a column-driven display is necessary for that view style.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2