In an activity diagram, an action state is a type of state that has an internal action and at least one outgoing transition that involves the explicit events that complete the internal action. In terms of notation, an action state represents the action-expression portion of the string describing an internal action in a state. A transition leaving an action state can be labeled with guard conditions and action expressions, but not with events.
Name an Action State 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.