For automation interface purposes, the Type Definition Order property is not an attribute of the owning item. The Type Definition Order property determines the order in which the Type Definitions are stored, and therefore the order they are returned through the automation interface. You cannot change the Type Definition Order through the automation interface.

This property specifies the order in which the Type Definitions of a Class, Data Type, Interface, Signal or Model are ordered. The Type Definition Order determines in which order the Type Definitions are listed on the Items tab of the owning item's Property Pages.

This property can be of importance when generating code from Type Definitions. The order in which an item's Type Definitions are ordered determines the order in which the Type Definitions are generated by ACS.

By default, a new Type Definition appears last in the Type Definition Order.

This property can be set on the Items tab of the Property Pages for the owning Class, Data Type, Interface, Signal or Model. To change the Type Definition Order, select a Type Definition in the list, and then click the required order button to change the Type Definition's position. There are four order buttons:

You can also set the Type Definition Order through the Packages and Relationships panes: Right-click the Type Definition you want to move, and then click Move Up (Alt+Shift+Up) or Move Down (Alt+Shift+Up).

The following section provides information about the items and diagrams for which Type Definition Order is a property. For more information about an item or diagram, click it.