All of the UML diagram elements share common context menu commands. To use the context menu for an element, simply right click on the element in the Diagram view. To view the common context menu commands, see Common Element Context Commands.
The actor and object elements offer the following special context menu commands:
Both the actor and object elements offer special context commands named Select Class and Unlink Class. Select Class expands to display a submenu that shows any classes that are "local" to the diagram and an option named, More, for browsing available classes that you wish to associate with the object.
Local Class List (Class1, Class2)
If there are classes that are "local" to the diagram, then they will be displayed in this list. Select the class from the list to associate it with the object.
More
Select More to open a file browsing dialog to choose a class to associate with an object.
Using the command, Unlink Class, allows you to unlink a previously linked class from an object.
Both the actor and object elements also have a special context command named, New, with a submenu for creating a new class or interface. When working with the UML 2.0 profile enabled, both elements also include the option to add a new Interaction Occurrence.

Class
Selecting New > Class from the context menu of the actor or object displays the New Object's Class dialog allowing you to create a new class:
Interface
Selecting New > Interface from the context menu of the actor or object displays the New Object's Interface dialog allowing you to create a new interface:
Interaction Occurrence (UML 2.0 only)
Selecting New > Interaction Occurrence from the context menu of the actor or object adds the interaction occurrence element to the sequence diagram.
Once a class or interface has been associated with an object, the Show Class command is enabled. This command offers special context commands named, In Editor, In Navigator, In Package Explorer, and In UML Navigator.
In Editor
Opens the source file in the Editor window.
In Navigator
Opens the Navigator view, navigates to and highlights the source file in the view.
In Package Explorer
Opens the Package Explorer view, navigates to and highlights the source file in the view.
In UML Navigator
Opens the UML Navigator view, navigates to and highlights the source file in the view.

The activation bar for object elements offers the New command with a submenu for adding statement blocks. For more information, see Generating Source Code from Sequence Diagrams.
In addition to the common context menu commands the interaction occurrence element offers the Select Objects command.
Using the Select Objects command displays the Choose elements dialog. This dialog allows you to navigate through the model elements, and associate objects with the interaction occurrence element.