gio:action-group-activate-action (group name parameter)

group -- a g:action-group instance
name -- a string for the name of the action to activate
parameter -- a g:variant parameter to the activation

Activate the named action within the action group. If the action is expecting a parameter, then the correct type of the parameter must be given as parameter. If the action is expecting no parameters then the parameter argument must be a cffi:null-pointer, see the g:action-group-action-parameter-type function.