LayoutControl.CustomizationLabel Attached Property
Gets or sets a custom label for a layout item, when this item is displayed in the Available Items List. This is an attached property.
An object that represents a label for an item when this item is displayed in the Available Items List.
Layout items can be hidden in the Available Items List. For these items, you can provide custom labels via the CustomizationLabel property.
The default label for items displayed in the Available Items List is calculated by the LayoutControl.GetCustomizationDefaultLabel method. See this link to learn more.