TProperty.Custom Property
Indicates if the property is a custom property.
Remarks
A custom property is a property that is not a direct access to a real property of the object instance. Instead, it works as a virtual property, where the getter and setter are provided by the programmer using RegisterCustomProperty procedure. This way the property is saved and writted in a custom way, and it's up to the programmer where to save and load the values.
Syntax
Unit: PropertyList
property TProperty.Custom: Boolean