g-action-group-activate-action (group name parameter)

group -- a g-action-group object
name -- a string with the name of the action to activate
parameter -- the 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 null-pointer, see the g-action-group-action-parameter-type function.