Set the action to be activated when a secondary activation event (i.
e. a middle-click) is emitted over the Indicator icon/label.
For the action to get activated when a secondary activation occurs in the
Indicator, it must be defined as a stateless
Action with no parameter, it needs to be enabled and associated with an item
of the menu.
Setting action to null disables this feature.
| this |
The Indicator |
| action |
The action to be activated on secondary activation |