A signal is a generalizable element defined independently of the classes handling the signal. It specifies an asynchronous stimulus communicated between instances to which there is no reply. The receiving instance handles the signal by a state machine. A signal can be attached to a classifier, which means that instances of the classifier can receive the signal.
Name a Signal shape and add other property values
Open the element's UML Properties dialog box by double-clicking the icon that represents the element in the tree view or the shape that represents the element in a diagram.
Control which property values display on a shape in a diagram by right-clicking the shape, and then clicking Shape Display Options. In the UML Shape Display Options dialog box, select and clear options to display or hide property values.
Control which property values are displayed on the Signal shape
Right-click the shape, click Shape Display Options, and then select or clear options to show or hide values.
Hide the parameters on a Signal shape
Right-click the shape, click Shape Display Options, and then, under Suppress, select Parameter.
Navigate to other views of the signal
Right-click the shape, click Views, select the view you want, and then click OK.
Show, in a view, the relationships between the signal and other elements
Right-click the shape, and then click Show Relationships.