Indicates whether the current class can represent an item in the New Action, when objects of another type are displayed in the List View.
true, if the current class can represent the New Action's item, when objects of another type are displayed in the List View; otherwise, false.
By default, this property is set to the IsCreatableItem property value of the current class' base class.
This property value is set to true if the DefaultClassOptions or CreatableItem(true) attribute is applied to the class declaration. You can change the default behavior by adding or removing the corresponding item from the IModelCreatableItems node.