g-action-group-change-action-state (group name parameter)

group -- a g-action-group object
name -- a string with the name of the action to request the change on
parameter -- the new g-variant state

Request for the state of the named action within the action group to be changed to the parameter argument. The action must be stateful and parameter must be of the correct type, see the g-action-group-action-state-type function. This call merely requests a change. The action may refuse to change its state or may change its state to something other than value, see the g-action-group-action-state-hint function.