This is done automatically by the component when a control linked to this action is activated: i.e. clicked for a Button, a ToggleButton, a ToolButton or a Menu, shown or hidden for a SidePanel, a ToolBar or a Window.

An activated action is handled in the window the control belongs to by a method named Action_Activate returning a boolean value.

If this method does not exist, or if it returns TRUE:

If the control window is embedded, then the Action_Activate of the parent window is tried.
If the window is top-level, then the action is silently dropped.