This enumeration lists the various options for the method of filtering to be used when applying the ToolboxItemFilterAttribute . public enum ToolboxItemFilterType { Allow = 0 , Custom = 1 , Prevent = 2 , Require = 3 } HierarchySystem.Object System.ValueType System.Enum(System.IComparabl, System.IFormattable , System.IConvertible) ToolboxItemFilterType Returned ByToolboxItemFilterAttribute.FilterType Passed ToToolboxItemFilterAttribute.ToolboxItemFilterAttribute( ) |