property Property.UserData as Variant
Gets or sets the user-definable data for the current object.

TypeDescription
Variant A Variant value that defines the property's user data.

Use the UserData event to associate a user value to a property. Use the Property property to access to a property object. The Name property specifies the property's name. The Value property specifies the property's value. Use the ID property to identify a property.

The following sample associates an extra string to the property "Visible":

PropertiesList1.Property("Visible").UserData = "A constant string"